Superconductivity of barium with highest transition temperatures in metallic materials at ambient pressure.

ABSTRACT: Pressure-induced superconductivity often occurs following structural transition under hydrostatic pressure (P_HP) but disappears after the pressure is released. In the alkali-earth metal barium, superconductivity appears after structural transformation from body-centered cubic structure to hexagonal-close-packed (hcp) structure at P_HP = 5 GPa, and the superconducting transition temperature (T_c) reaches a maximum of 5 K at P_HP = 18 GPa. Furthermore, by stabilizing the low-temperature phase at P_HP ~ 30 GPa, Tc reached a higher level of 8 K. Herein, we demonstrate a significantly higher T_c superconductivity in Ba even at ambient pressure. This was made possible through severe plastic deformation of high-pressure torsion (HPT). I

SUBMITTER: Mito M 

PROVIDER: S-EPMC10791626 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature