KFe2As2 single crystals are studied using specific-heat, high-resolution thermal-expansion, magnetization, and magnetostriction measurements. The magnetization and magnetostriction data provide clear evidence for strong Pauli-limiting effects of the upper critical field for magnetic fields parallel to the FeAs planes, suggesting that KFe 2As2 may be a good candidate to search for the Fulde-Ferrell-Larkin-Ovchinnikov state. Using standard thermodynamic relations, the uniaxial pressure derivatives of the critical temperature Tc, the normal-state Sommerfeld coefficient γn, the normal-state susceptibility χ, and the thermodynamic critical field Hc are calculated from our data. We find that the close relationship between doping and pressure as found in other Fe-based systems does not hold for KFe 2As2.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2013 Jul 19|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics