New way helps superconductor break temperature record, PgII

Key Highlights:

• Scientists achieved superconductivity in a copper oxide material (Hg1223) at -122°C under normal pressure using a new technique called pressure quenching.
• This breaks the previous record of -140°C for superconductivity at room pressure, which was also held by Hg1223 since 1993.
• The pressure-quench protocol (PQP) involves compressing, cooling, and rapidly releasing pressure on the material to trap its superconducting state.
• The team confirmed that roughly 78% of the material's volume became superconducting, indicating a bulk property.

Detailed Insights:

• The pressure quenching method induces defects and internal strain in the material's crystal structure, mimicking the effects of pressure even after its removal.
• Superconductors operating at room temperature and normal pressure could revolutionize power grids, MRI machines, electric motors, transportation, and renewable energy infrastructure.
• The University of Houston team's work may enable the stabilization of exotic electronic properties in other materials under ordinary conditions.
• Past controversies in high-temperature superconductivity research, such as those involving Ranga Dias and the LK-99 material, have heightened scrutiny in the field.
• Ching-Wu Chu, the lead investigator, is a pioneer in high-temperature superconductivity, known for his 1987 discovery of yttrium barium copper oxide (YBCO), which superconducts at liquid nitrogen temperatures.

Scientific/Technical Concepts Involved:

• Superconductivity: A phenomenon where a material conducts electricity with zero resistance below a critical temperature.
• Pressure Quenching: A technique involving applying and rapidly releasing pressure to stabilize material properties.
• Diamond Anvil Cell: A high-pressure device used to compress materials for studying their properties under extreme conditions.