Effects of pressure on Tc in (Tl0.59Cs0.26) Fe1.9Se2
Abstract
Hydrostatic-pressure (up to 0.96 GPa) dependence of Tc in a newly discovered Fe-based superconductor (Tl0.59Cs0.26) Fe1.9Se2 is reported. The room temperature powder x-ray diffraction and crystallographic data provide the evidence for bulk superconductivity with Tc around 28 K in a tetragonal ThCr2Si2-type structure at ambient pressure. 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 may not be sufficient to account for the observations if the lattice parameters of the unit cell are linearly decreased with the hydrostatic pressure.
Supported by the National Science Council of Republic of China under Contract Numbers NSC-99-2112-M-194-006-MY3 and NSC-101-2811-M-194-016.- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2013
- Bibcode:
- 2013APS..MAR.V1154C