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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 foroverdoped Fe-based superconductors. Arguments are presented thatsuperconductivity in KFe2As2 may be different from the other overdoped,Fe-based materials in the 122 family.

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