Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe2As2 single crystals

Sergey L. Bud'ko, Yong Liu, Thomas A. Lograsso, and Paul C. Canfield
Phys. Rev. B 86, 224514 – Published 26 December 2012

Abstract

We present heat capacity, c-axis thermal expansion and pressure-dependent, low-field, temperature-dependent magnetization for pressures up to 12 kbar, data for KFe2As2 single crystals. Tc decreases under pressure with dTc/dP0.10 K/kbar. The inferred uniaxial, c-axis, pressure derivative is positive, dTc/dpc0.11 K/kbar. The data are analyzed in comparison with those for overdoped Fe-based superconductors. Arguments are presented that superconductivity in KFe2As2 may be different from the other overdoped, Fe-based materials in the 122 family.

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  • Received 4 December 2012

DOI:https://doi.org/10.1103/PhysRevB.86.224514

©2012 American Physical Society

Authors & Affiliations

Sergey L. Bud'ko1,2, Yong Liu1, Thomas A. Lograsso1, and Paul C. Canfield1,2

  • 1The Ames Laboratory, US Department of Energy, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

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Issue

Vol. 86, Iss. 22 — 1 December 2012

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