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

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arxiv 1003.2209 v1 pith:PJ65AM6T submitted 2010-03-10 cond-mat.supr-con cond-mat.str-el

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

Hechang Lei , Rongwei Hu , E. S. Choi , J. B. Warren , C. Petrovic This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords propertiesu0hc2analysisanisotropycriticalexcessfieldmagnetotransport
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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