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
TL;DR
This study investigates how hydrostatic and uniaxial pressures affect the superconducting transition temperature of KFe2As2 single crystals, revealing pressure-dependent behavior and potential differences from related Fe-based superconductors.
Contribution
It provides the first detailed analysis of pressure effects on KFe2As2's superconductivity, highlighting distinct characteristics compared to other overdoped Fe-based superconductors.
Findings
Tc decreases with hydrostatic pressure (~ -0.10 K/kbar)
Uniaxial, c-axis pressure increases Tc (~ 0.11 K/kbar)
Superconductivity in KFe2As2 may differ from other Fe-based 122 superconductors
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/dP ~ -0.10 K/kbar. The inferred uniaxial, c-axis, pressure derivative is positive, dTc/dpc ~ 0.11 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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