Phys.org July 8, 2021
The grand challenge in superconductivity research and development is no longer restricted to further increasing the superconducting transition temperature under extreme conditions and must now include concentrated efforts to lower, and better yet remove, the applied pressure required. An international team of researchers (USA – Houston University, Rice University, China) has shown such a possibility in the pure and doped high-temperature superconductor FeSe by retaining, at ambient pressure via pressure quenching, its Tc up to 37 K and other pressure-induced phases. They observed that some phases remain stable without pressure at up to 300 K and for at least 7 d. The observations are in qualitative agreement with their ab initio simulations using the solid-state nudged elastic band method. They believe that the pressure quenching technique they developed can be adapted to the room temperature superconductivity hydrides and other materials of value with minimal effort…read more. TECHNICAL ARTICLEÂ