Hydrogen-rich superconductors under extreme pressure: challenges, progress, and opportunities
Yansun Yao1, Mila June Carpenter-Bloudoff1
1Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada.
Summary
Superhydrides show promise for high-temperature superconductivity. Advances in experimental and theoretical methods are driving progress, despite past scrutiny, toward achieving ambient superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- High-temperature superconductivity discovery in lanthanum sulfur hydrides under extreme pressure spurred research into superhydrides.
- The field faces scrutiny due to retracted claims, increasing emphasis on experimental standards and rigor.
Purpose of the Study:
- Provide a balanced overview of progress, challenges, and opportunities in superhydride research.
- Discuss emerging techniques and theoretical advancements shaping the field.
- Assess the feasibility of ambient-condition superconductivity.
Main Methods:
- Local quantum sensing for direct Meissner effect measurements.
- High-throughput crystal structure prediction and machine learning for hydride screening.
- Theoretical modeling of novel phenomena like the fluxional hydrogen lattice.
Main Results:
- Development of new ternary and higher-order hydrides with novel structural motifs like the 'alloy backbone'.
- Stabilization of hydrogen-rich frameworks at reduced pressures.
- Refined understanding of electron-phonon coupling in superconductivity.
Conclusions:
- Superhydride research is advancing with enhanced rigor and novel methodologies.
- Emerging techniques and theoretical insights offer pathways to ambient superconductivity.
- Methodologies developed for superhydrides impact broader materials discovery in condensed matter physics.
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