Weak anisotropy of the superconducting upper critical field in Fe1.11Te0.6Se0.4 single crystals
Minghu Fang, Jinhu Yang, F. F. Balakirev, Y. Kohama, J. Singleton, B. Qian, Z. Q. Mao, Hangdong Wang, H. Q. Yuan
DOI 10.1103/PhysRevB.81.020509 · Physical Review B
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Abstract
We have determined the resistive upper critical field Hc2 for single crystals of the superconductor Fe1.11Te0.6Se0.4 using pulsed magnetic fields of up to 60 T. A rather high zero-temperature upper critical field of μ0Hc2(0)≈47 T is obtained in spite of the relatively low superconducting transition temperature (Tc≈14 K). Moreover, Hc2 follows an unusual temperature dependence, becoming almost independent of the magnetic field orientation as the temperature T→0. We suggest that the isotropic superconductivity in Fe1.11Te0.6Se0.4 is a consequence of its three-dimensional Fermi-surface topology. An analogous result was obtained for (Ba,K)Fe2As2, indicating that all layered iron-based superconductors exhibit generic behavior that is significantly different from that of the “high-Tc” cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Fe1.11Te0.6Se0.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | midpoint |
| Fe1.11Te0.6Se0.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | onset |
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