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Upper critical magnetic field in K0.83Fe1.83Se2 and Eu0.5K0.5Fe2As2 single crystals

The H-T phase diagrams of single crystalline electron-doped K0.83Fe1.83Se2 (KFS1), K0.8Fe2Se2 (KFS2) and hole-doped Eu0.5K0.5Fe2As2 (EKFA) have been deduced from tunnel diode oscillator-based contactless measurements in pulsed magnetic fields up to 57 T for the inter-plane (H//c) and in-plane (H//ab) directions. The temperature dependence of the upper critical magnetic field Hc2(T) relevant to EFKA is accounted for by the Pauli model including an anisotropic Pauli paramagnetic contribution (μ_BHp=114 T for H//ab and 86 T for H//c). This is also the case of KFS1 and KFS2 for H//ab whereas a significant upward curvature, accounted for by a two-gap model, is observed for H//c. Despite the presence of antiferromagnetic lattice order within the superconducting state of the studied compounds, no influence of magnetic ordering on the temperature dependence of Hc2(T) is observed.

preprint2013arXivOpen access
Vitaly A. GasparovA. AudouardL. DrigoA. I. RodiginC. T. LinW. P. LiuM. ZhangA. F. WangX. H. ChenH. S. JeevanJ. MaiwaldP. Gegenwart
cond-mat.supr-con
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Open access12 authors1 topic
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Vitaly A. GasparovA. AudouardL. DrigoA. I. RodiginC. T. LinW. P. LiuM. ZhangA. F. WangX. H. ChenH. S. JeevanJ. MaiwaldP. Gegenwart

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