Upper critical magnetic field in K0.83Fe1.83Se2 and Eu0.5K0.5Fe2As2 single crystals
| Autor: | Gasparov, Vitaly A., Audouard, A., Drigo, L., Rodigin, A. I., Lin, C. T., Liu, W. P., Zhang, M., Wang, A. F., Chen, X. H., Jeevan, H. S., Maiwald, J., Gegenwart, P. |
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| Rok vydání: | 2013 |
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| Zdroj: | Phys. Rev. B 87, 094508 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.87.094508 |
| Popis: | 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 (\mu_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. Comment: 9 pages, 5 figures. arXiv admin note: text overlap with arXiv:1104.5619 |
| Databáze: | arXiv |
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