Strong Pauli-limiting behavior of Hc2 and uniaxial pressure dependencies in KFe2As2

P. Burger, F. Hardy, D. Aoki, A. E. Böhmer, R. Eder, R. Heid, T. Wolf, P. Schweiss, R. Fromknecht, M. J. Jackson, C. Paulsen, C. Meingast

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33 Citations (Scopus)


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.

Original languageEnglish
Article number014517
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
Publication statusPublished - 2013 Jul 19


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