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Paper detail

Evidence for dominant Pauli paramagnetic effect in the upper critical fields of a FeTe0.6Se0.4 superconductor

We investigate temperature-dependence of the upper critical fields Hc2(T) of a superconducting FeTe0.6Se0.4 single crystal by measuring resistivity in static magnetic fields up to 45 T. The observations of strong bending in the Hc2ab(T) curves and nearly isotropic Hc2ab(0) ~ Hc2c(0) ~ 48 T support the presence of strong Pauli paramagnetic effect. We show that the Werthamer-Helfand-Hohenberg formula considering the Pauli limiting and the spin-orbit scattering together can effectively describe both Hc2ab(T) and Hc2c(T) curves. The enhancement in quasi-particle density of states or increased scattering resulting from Te(Se) vacancy or excess Fe is discussed as a possible origin for the manifesting Pauli paramagnetic effect.

preprint2010arXivOpen access
Seunghyun KhimJae Wook KimEun Sang ChoiYunkyu BangMinoru NoharaHidenori TakagiKee Hoon Kim
cond-mat.supr-con
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Seunghyun KhimJae Wook KimEun Sang ChoiYunkyu BangMinoru NoharaHidenori TakagiKee Hoon Kim

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