Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

2-1-2016

Journal or Book Title

Physical Review B

Volume

93

Issue

6

First Page

064503

DOI

10.1103/PhysRevB.93.064503

Abstract

The pressure dependence of the upper critical field, Hc2,c, of single crystalline FeSe was studied using measurements of the interplane resistivity, ρc, in magnetic fields parallel to tetragonal c axis. Hc2,c(T) curves obtained under hydrostatic pressures up to 1.56 GPa, the range over which the superconducting transition temperature, Tc, of FeSe exhibits a nonmonotonic dependence with local maximum at p1≈0.8 GPa and local minimum at p2≈1.2 GPa. The slope of the upper critical field at Tc,(dHc2,c/dT)Tc, also exhibits a nonmonotonic pressure dependence with distinct changes at p1 and p2. For pp2 the slope is in good semiquantitative agreement with a single band, orbital Helfand-Werthamer theory with Fermi velocities determined from Shubnikov–de Haas measurements. This finding indicates that Fermi surface changes are responsible for the local minimum of Tc(p) at p2≈1.2 GPa.

Comments

This article is published as Kaluarachchi, Udhara S., Valentin Taufour, Anna E. Böhmer, Makariy A. Tanatar, Sergey L. Bud'ko, Vladimir G. Kogan, Ruslan Prozorov, and Paul C. Canfield. "Nonmonotonic pressure evolution of the upper critical field in superconducting FeSe." Physical Review B 93, no. 6 (2016): 064503. DOI: 10.1103/PhysRevB.93.064503. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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