Pressure effects on Tc in superconducting (Tl, Cs) 1-xFe2-ySe2
Journal
Journal of Applied Physics
Journal Volume
113
Journal Issue
15
Date Issued
2013
Author(s)
Abstract
Hydrostatic-pressure (up to 0.96 GPa) dependence of Tc in a newly discovered Fe-based superconductor (Tl0.59Cs 0.26)Fe1.9Se2 (Tc 28 K, at ambient pressure) is reported. Static magnetization measurements under pressure indicate that the linear increase in Tc is initially rapid (dTc/dP ∼ 9.9 K · GPa-1) but slows down to dTc/dP ∼ 2.5 K · GPa-1 for P 0.18 GPa. The Tc of the superconducting phase is 32 K at pressure P 0.96 GPa. The simple rigid band model or the Bardeen, Cooper, Schrieffer theory may not be sufficient to account for our observations, if one assumes that the lattice parameters would be linearly decreased with pressure. © 2013 AIP Publishing LLC.
Other Subjects
Ambient pressures;Fe-based superconductors;Rigid-band model;Static magnetization;Superconducting phase;Cesium;Superconductivity
Type
journal article