The research team, led by eminent physicists Ching-Wu Chu and Liangzi Deng, have demonstrated a superconducting transition temperature (Tc) of 151 Kelvin—equivalent to approximately minus 122 degrees Celsius—accomplished at normal atmospheric pressure. This milestone surpasses the previous record-holder, a mercury-based copper oxide superconductor known as Hg1223, which exhibited superconductivity at 133 Kelvin under similar conditions. Since superconductivity’s initial discovery in 1911, achieving higher transition temperatures has been the Holy Grail of condensed matter physics, as higher Tc materials broaden the practical applicability of superconductors by obviating the need for prohibitively expensive and complex cooling methods.

Superconductivity’s defining characteristic is the complete disappearance of electrical resistance, allowing current to flow unimpeded through a material. This phenomenon empowers a variety of high-impact applications such as ultra-efficient power grids, highly sensitive magnetic resonance imaging systems, and systems for fusion energy generation. Still, most known superconductors require extremely low temperatures, often maintained by liquid helium or nitrogen, constraining their widespread adoption. The University of Houston team’s advance brings the scientific community a step closer to ambient temperature superconductivity, potentially transforming how electricity is harnessed and utilized globally.

The research, published in the Proceedings of the National Academy of Sciences, employs a sophisticated technique known as pressure quenching, a methodology inspired by similar processes used in material synthesis like diamond creation. Firstly, the team applies intense pressure to enhance the superconductor’s properties, elevating its intrinsic transition temperature while under compression. They then cool the material to a specific temperature before rapidly releasing the pressure, effectively “locking in” the enhanced superconducting state so that these improved properties persist even after the material returns to ambient conditions.

“This work bridges a critical gap by stabilizing high-temperature superconductivity at normal pressure,” explained Professor Chu, who has long been a pioneer in the field following his seminal 1987 discovery of high-temperature superconductivity in yttrium barium copper oxide (YBCO) at 93 Kelvin. That discovery catalyzed decades of research leading to superconductors capable of functioning at progressively warmer conditions, but none had previously managed to maintain such properties without the continuous application of high pressure.

Assistant Professor Liangzi Deng emphasized the broader implications of this technique for future research. “The ability to maintain enhanced superconductivity at ambient pressure facilitates the use of conventional experimental setups for detailed characterization and accelerates the path toward practical applications,” he stated. As the material’s performance no longer hinges on maintaining extreme conditions, manufacturers and engineers can envision scalable uses in energy-efficient technologies.

The significance of this development cannot be overstated. Conventional electrical grids lose nearly eight percent of generated electricity en route to consumers, mainly due to resistance in conductors. Should superconductivity at higher temperatures become commonplace, grid transmission losses could be drastically curtailed, translating into billions of dollars in savings and a substantial reduction in environmental impacts related to power generation.

The discovery also resonates with ongoing efforts to develop next-generation fusion reactors, where superconducting magnets play a crucial role in stabilizing plasma. Enhanced superconductors that operate closer to ambient conditions could dramatically reduce the complexity and cost of magnetic confinement systems, accelerating the realization of viable fusion power plants.

Superconductors also hold promise in revolutionizing electronic devices by enabling ultra-fast and energy-efficient circuits. The newfound stability of high-Tc states at normal pressure opens avenues for innovative electronics and magnetic sensor technologies that no longer require cumbersome cooling.

Prior to this integral contribution, pressure-induced enhancements in superconductivity necessitated maintaining the applied pressure, a condition incompatible with many technological applications. This advance’s methodological ingenuity lies in preserving the high-Tc superconducting phase after depressurization, an enduring challenge that the team has overcome through meticulous control of the pressure-temperature quenching parameters.

Moreover, the researchers’ findings have spurred accompanying theoretical and methodological discussions. A companion paper published alongside the main study details a spectrum of six techniques to tune superconducting materials toward higher transition temperatures. It underscores pressure quenching as an especially promising method, offering a strategic blueprint for researchers pursuing room-temperature superconductivity.

Despite the considerable progress, a gap remains between the newly achieved 151 Kelvin Tc and the coveted goal of room-temperature superconductivity at approximately 300 Kelvin. Bridging this chasm will require sustained, interdisciplinary collaboration, combining insights from material science, chemistry, physics, and engineering. The breakthrough, however, demonstrates that higher-temperature ambient pressure superconductors are within reach, galvanizing the scientific community to intensify efforts toward this transformational objective.

Intellectual Ventures, a visionary global invention and investment entity, funded the research, reflecting a growing recognition within industry and investment sectors of superconductivity’s transformative potential. The collaborative synergy between academia, industry, and government resources highlights the urgent and broad interest in overcoming the practical limitations of superconductive phenomena.

In summary, this unprecedented work by the University of Houston team marks an electrifying advancement in superconductivity research. By pushing past the historical barriers of transition temperature and stabilizing superconductivity under everyday conditions, the pathway toward next-generation energy infrastructure and transformative technologies has become clearer. The scientific frontier of room-temperature superconductivity is no longer a distant aspiration but an achievable future, with profound implications for the global economy and environment.

Subject of Research: Superconductivity at ambient pressure and enhanced transition temperature through pressure quenching techniques

Article Title: University of Houston researchers break temperature record for ambient-pressure superconductivity

News Publication Date: March 9, 2024

Web References:

• Original research: https://www.pnas.org/doi/10.1073/pnas.2536178123
• Companion perspective paper: https://www.pnas.org/doi/10.1073/pnas.2520324123
• Intellectual Ventures: https://www.intellectualventures.com/

Image Credits: University of Houston

Keywords

Superconductivity, High-temperature superconductors, Electrical resistance, Pressure quenching, Transition temperature, Ambient pressure superconductors, Energy transmission, Electrical grids, Fusion energy, YBCO, Hg1223, Energy storage

Traditionally, superconductivity has only manifested in materials cooled to temperatures hovering near absolute zero, rendering widespread application impractical and costly. Breakthroughs began to emerge in the late 20th century, with discoveries of high-temperature superconductors, such as copper-oxide ceramics, which can superconduct at temperatures above the boiling point of liquid nitrogen (77 K). Although this was a significant leap, the ultimate goal remained elusive: superconductivity at or near room temperature under manageable conditions.

A transformative development came with the advent of hydrogen-rich metallic compounds, particularly hydrogen sulfide (H₃S) and lanthanum decahydride (LaH₁₀). These materials demonstrate superconductivity at unprecedentedly high temperatures of 203 Kelvin (-70°C) and 250 Kelvin (-23°C), respectively, when subjected to enormous pressures exceeding one million times atmospheric pressure. These transition temperatures, well above that of liquid nitrogen, have captivated researchers worldwide, ushering in a new class of "high-temperature" superconductors that hint at the possibility of room-temperature superconductivity.

Central to understanding this phenomenon is the superconducting gap, a quantum mechanical property that defines the energy required to break the electron pairs—known as Cooper pairs—that facilitate resistance-free conductivity. This gap acts as a fingerprint of the superconducting state, offering critical information on the strength and nature of the interaction between electrons and lattice vibrations (phonons). Unraveling the precise characteristics of this gap is vital for decoding the mechanism underpinning superconductivity in these sophisticated materials.

However, probing the superconducting gap in hydrogen-rich compounds like H₃S presents a formidable challenge. Their synthesis demands extremely high pressures, conditions that render conventional measurement techniques such as scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy ineffective. The extraordinary environment makes direct experimental access to the superconducting state tremendously difficult, limiting understanding of these materials’ microscopic properties.

Addressing this barrier, scientists at the Max Planck Institute in Mainz developed a novel planar electron tunneling spectroscopy method capable of operating under such extreme conditions. This breakthrough technique was successfully applied to H₃S, marking the first direct observation of its superconducting gap. This accomplishment not only provides vital experimental validation for theoretical models but also opens the door to comprehensive studies of other complex hydride superconductors created under ultrahigh pressures.

The experimental data reveal that H₃S possesses a fully open superconducting gap measuring approximately 60 millielectronvolts (meV), a value that strongly signifies a robust pairing mechanism. In comparison, the deuterium analogue D₃S exhibits a smaller gap around 44 meV. Deuterium’s heavier isotope nature confirms that electron-phonon coupling is the driving force behind superconductivity in these systems, affirming longstanding theoretical predictions regarding lattice vibrations facilitating electron pairing in hydrides.

This discovery provides pivotal insights into the fundamental mechanisms of hydrogen-based high-temperature superconductors. By confirming phonon-mediated electron pairing through isotope substitution, researchers can better understand the requisites for high critical temperatures. Importantly, this knowledge forms a solid groundwork upon which scientists can explore new hydrogen-rich materials with the potential to reach or even exceed room temperature superconductivity.

The implications of this progress extend beyond pure science. Unlocking room-temperature superconductivity could enable transformative applications, such as highly efficient power grids free from transmission losses, ultra-compact and fast quantum computers, and revolutionary magnetic levitation transport systems. The key lies in engineering materials that sustain superconductivity at ambient pressures, making them accessible and practical beyond specialized laboratory conditions.

Leading figures in the field have heralded this research as a watershed moment. The late Dr. Mikhail Eremets, a pioneer recognized for his seminal work on high-pressure superconductivity, described the study as the most significant since the initial discovery of superconductivity in H₃S in 2015. His visionary work laid the foundation for exploring hydrogen-rich compounds under pressure as promising routes toward high-temperature superconductivity, a dream now one step closer to reality thanks to these new findings.

Dr. Vasily Minkov, head of High-Pressure Chemistry and Physics at the Max Planck Institute for Chemistry, emphasized that this advancement aligns perfectly with Eremets’ decades-long vision of pragmatic superconductors operating at manageable pressures and temperatures. The refined tunneling technique is poised to become a critical tool for future explorations, enabling systematic investigations across a broader range of hydrides and beyond.

Fundamentally, the superconducting gap encapsulates the quantum essence of the superconducting phase. When electrons form Cooper pairs at temperatures below the critical temperature (T_c), they condense into a macroscopic quantum state with zero electrical resistance. The gap quantifies the energy threshold to disrupt these pairs, directly linking to the material’s superconducting robustness. Its symmetry and magnitude provide vital clues about the nature of electron interactions and pairing mechanisms, insights that are indispensable for material design.

Since the initial discovery of superconductivity in mercury by Heike Kamerlingh Onnes in 1911, scientific understanding has continuously advanced. The high-temperature cuprates discovered by Bednorz and Müller in the 1980s shattered earlier paradigms but still fell short of room temperature operation. Hydrogen-rich hydrides, through their distinctive lattice dynamics and electron-phonon interactions under pressure, represent the cutting edge of this quest, suggesting that room-temperature superconductivity may finally emerge within reach.

Looking ahead, researchers aim to extend the new tunneling spectroscopy technique to study additional hydride superconductors and other exotic compounds synthesized at ultrahigh pressures. The nuanced information gained from detailed gap measurements will illuminate the pathways to optimize electron pairing and material stability. This scientific journey holds the promise of uncovering materials with the ideal balance of temperature, pressure, and practical usability for future technologies.

In essence, this pioneering study heralds a new chapter in superconductivity research by providing the first direct measurement of the superconducting gap in H₃S under extreme conditions. It validates theoretical frameworks and solidifies our understanding of the quantum state in high-temperature hydrides. The aspiration for widespread, ambient-condition superconductors, once a distant dream, edges closer to tangible reality, promising profound technological impact in the upcoming decades.

Subject of Research: Not applicable

Article Title: Superconducting gap of H3S measured by tunnelling spectroscopy

News Publication Date: 23-Apr-2025

Web References: http://dx.doi.org/10.1038/s41586-025-08895-2

References: Nature, DOI: 10.1038/s41586-025-08895-2

Image Credits: Not provided

Keywords

Superconduction, Room temperature, Hydrogen

In their study titled “Creation, stabilization, and investigation at ambient pressure of pressure-induced superconductivity in Bi_0.5Sb_1.5Te₃,” the duo examined how applying high pressure to BST impacts its electronic characteristics. The findings of the study were published in the Proceedings of the National Academy of Sciences, a prestigious journal renowned for disseminating significant scientific discoveries. Their work highlights an important connection between pressure-induced superconductivity and the topology of the Fermi surface, leading to the discovery that critical changes could be achieved without altering the material’s fundamental chemistry.

Historically, many superconductors have only exhibited their unique properties when subjected to high pressure, making them difficult to investigate. This limitation has hindered their practical application and has left researchers searching for effective ways to study these exotic materials. Chu emphasizes that most materials with vital industrial relevance often exist in a metastable state. This revelation underscores the challenges researchers face when working with such materials, as they are often stuck in conditions that are not conducive to practical research or application.

Deng and Chu’s recent research offers a promising solution to these challenges. Their innovative technique, which they refer to as the pressure-quench protocol (PQP), successfully stabilizes the high-pressure phases of BST at ambient pressure. The PQP framework is designed to manipulate electronic transitions, allowing researchers to retain material phases that previously existed only under extreme conditions. This could mark a pivotal moment in the study of superconductors, as it enables real-world applications without the need for specialized equipment to maintain high-pressure environments.

One of the standout implications of this breakthrough is its potential to dive deeper into the physics of materials that remain elusive under normal atmospheric conditions. Dong notes that this research not only stabilizes existing high-pressure phases but also provides a pathway to discovering entirely new states of matter. Such findings could open up an assortment of avenues for future research, possibly leading to the identification of additional superconducting materials or new physical phenomena that can be harnessed for technological advancements.

The techniques employed in the PQP pave the way for testing various materials under conditions that were previously thought impossible. By revealing subtle electronic transitions without changes in symmetry, researchers can now push the boundaries of traditional material science. The scope for future experimentation is vast, and it could lead to a better understanding of the underlying principles governing superconductivity and other complex physical behaviors.

The possible applications of stabilized superconductivity are both extensive and intriguing. Superconductors operate without electrical resistance, making them incredibly efficient for energy transmission and storage. If researchers can identify high-transition-temperature superconductors that are operational under ambient conditions, the implications for energy systems, transportation technologies, and medical magnetic resonance imaging devices could be monumental. The ability to utilize superconducting materials in daily applications could drastically reduce energy losses and lead to innovative developments in power infrastructure.

Furthermore, this research emphasizes the importance of fostering collaborations across various scientific disciplines. The merging of physics, material science, and engineering could facilitate breakthroughs that address significant challenges. As universities and research institutions continue to explore cooperative relationships, they may unlock new insights into complex phenomena and produce revolutionary applications that enhance our technological capabilities.

The potential for ongoing discoveries stemming from this research is vast, as scientists not only pursue practical applications of superconductivity but also delve into the theoretical underpinnings of such materials. The interplay between theory and experimentation will be essential for advancing the field of superconductivity, which remains one of the most exciting areas in material science. The contributions made by Deng and Chu could inspire a new wave of discoveries that further enrich our understanding of how materials behave under various conditions.

As researchers build on the foundations laid by this study, new questions will arise, and the drive for innovation will be relentless. The exploration of pressure-induced superconductivity provides an exciting window into the complexities of material science, and it is likely that future studies will continue to unravel the mysteries surrounding superconductivity. Given the involvement of research centers like the Texas Center for Superconductivity, it is plausible that this momentum will carry forward, yielding even more groundbreaking findings.

To contextualize the work being done at the University of Houston, it is vital to recognize the wider landscape of superconductor research globally. Numerous international collaborations are dedicated to investigating various classes of superconductors. This expansive network of research plays a crucial role in disseminating knowledge and sharing experimental techniques. In doing so, scientists can lower redundancies in research and leverage collective expertise to drive further advancements.

Overall, the implications of this transformative research extend far beyond the confines of academia. The pursuit of ambient-pressure superconductivity signifies a leap towards more sustainable technologies that capitalize on energy efficiency and reduce waste. By bringing superconductors one step closer to practical use, researchers at the University of Houston are not merely contributing to an existing body of knowledge; they are forging a path that intersects with real-world applications. This effort not only underscores the importance of scientific inquiry but also shapes our expectations for the future of technology and the role materials will play in global innovations.

In light of these developments, the future looks promising for researchers exploring ambient-pressure superconductivity. Their work could pave the way for revolutionary advancements in energy technologies, transforming industries and potentially enhancing the quality of life globally through improved efficiencies. This pursuit embodies the very essence of scientific endeavors: the quest for knowledge that not only seeks to understand the world but also aims to enhance it.

Subject of Research: Superconductivity in Bi_0.5Sb_1.5Te₃
Article Title: Creation, stabilization, and investigation at ambient pressure of pressure-induced superconductivity in Bi_0.5Sb_1.5Te₃
News Publication Date: 27-Dec-2024
Web References: DOI
References: Proceedings of the National Academy of Sciences
Image Credits: University of Houston

Keywords

Superconductors, Ambient-pressure superconductivity, Bi_0.5Sb_1.5Te₃, Energy efficiency, Material science, Electromagnetism, Physics, Experimental physics.