Abstract
We present heat capacity, -axis thermal expansion and pressure-dependent, low-field, temperature-dependent magnetization for pressures up to kbar, data for KFeAs single crystals. decreases under pressure with K/kbar. The inferred uniaxial, -axis, pressure derivative is positive, K/kbar. The data are analyzed in comparison with those for overdoped Fe-based superconductors. Arguments are presented that superconductivity in KFeAs may be different from the other overdoped, Fe-based materials in the 122 family.
- Received 4 December 2012
DOI:https://doi.org/10.1103/PhysRevB.86.224514
©2012 American Physical Society