Strong Pauli-limiting behavior of H_c2 and uniaxial pressure dependencies in KFe2As2

2013/03/27 by Burger, P., Hardy, F., Aoki, D. +8 · 1 citation
#FOS: Physical sciences #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.1303.6822

Abstract

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 (γ_n), the normal-state susceptibility (χ), 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.

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• Microscopic evidence for Fulde-Ferrel-Larkin-Ovchinnikov state and multiband effects in KFe₂As₂

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