Publication Date

5-1-2018

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Physics and Astronomy, Ames Laboratory

Report Number

IS-J 9681

DOI

10.1103/PhysRevB.97.174517

Journal Title

Physical Review B

Volume Number

97

First Page

174517

Abstract

The pressure dependence of the magnetic and superconducting transitions and that of the superconducting upper critical field are reported for CaK(Fe1-xNix)(4)As-4, the first example of an Fe-based superconductor with spin-vortex-crystal-type magnetic ordering. Resistance measurements were performed on single crystals with two substitution levels (x = 0.033,0.050) under hydrostatic pressures up to 5.12 GPa and in magnetic fields up to 9 T. Our results show that, for both compositions, magnetic transition temperatures T-N are suppressed upon applying pressure; the superconducting transition temperatures T-c are suppressed by pressure as well, except for x = 0.050 in the pressure region where T-N and T-c cross. Furthermore, the pressure associated with the crossing of the T-N and T-c lines also coincides with a minimum in the normalized slope of the superconducting upper critical field, consistent with a likely Fermi-surface reconstruction associated with the loss of magnetic ordering. Finally, at p similar to 4 GPa, both Ni-substituted CaK(Fe1-xNix)(4)As-4 samples likely go through a half-collapsed-tetragonal phase transition, similar to the parent compound CaKFe4As4.

Language

en

Department of Energy Subject Categories

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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