%0 Journal Article
%T Strong Pauli-limiting behavior of $H_{c2}$ and uniaxial pressure dependencies in KFe2As2
%A P. Burger
%A F. Hardy
%A D. Aoki
%A A. E. B£¿hmer
%A R. Heid
%A T. Wolf
%A P. Schweiss
%A R. Fromknecht
%A M. J. Jackson
%A C. Paulsen
%A C. Meingast
%J Physics
%D 2013
%I arXiv
%X 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 for magnetic fields parallel to the FeAs planes, suggesting that KFe2As2 may be a good candidate to search for the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. Using standard thermodynamic relations, the uniaxial pressure derivatives of the critical temperature ($T_{c}$), the normal-state Sommerfeld coefficient ($\gamma_{n}$), the normal-state susceptibility ($\chi$), and the thermodynamic critical field ($H_{c}$) 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 KFe2As2.
%U http://arxiv.org/abs/1303.6822v2