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Effects of excess Fe on upper critical field and magnetotransport in Fe1+y(Te1-xSx)z

We have investigated the upper critical field anisotropy and magnetotransport properties of Fe1.14(1)Te0.91(2)S0.09(2) single crystals in stable magnetic fields up to 35 T. The results show that u0Hc2(T) along the c axis and in the ab-plane exhibit saturation at low temperatures. The anisotropy of u0Hc2(T) decreases with decreasing temperature, becoming nearly isotropic for T->0. Our analysis indicates that the spin-paramagnetic pair-breaking with spin-orbital scattering is responsible for the behavior of u0Hc2(T). Furthermore, from analysis of the normal state properties, we show evidence that the excess Fe acting as Kondo-type impurities is a key factor determining the normal and superconducting state physical properties.

preprint2010arXivOpen access
Hechang LeiRongwei HuE. S. ChoiJ. B. WarrenC. Petrovic
cond-mat.supr-concond-mat.str-el
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Hechang LeiRongwei HuE. S. ChoiJ. B. WarrenC. Petrovic

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