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Upper critical fields and superconducting anisotropy of K0.70Fe1.55Se1.01S0.99 and K0.76Fe1.61Se0.96S1.04 single crystals

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arxiv 1104.2318 v2 pith:PQ6M2DZZ submitted 2011-04-12 cond-mat.supr-con cond-mat.mtrl-sci

Upper critical fields and superconducting anisotropy of K0.70Fe1.55Se1.01S0.99 and K0.76Fe1.61Se0.96S1.04 single crystals

classification cond-mat.supr-con cond-mat.mtrl-sci
keywords anisotropycontentcriticalcrystalsdecreasefieldssingleupper
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have investigated temperature and angular dependence of resistivity of K0.70(7)Fe1.55(7)Se1.01(2)S0.99(2) and K0.76(5)Fe1.61(5)Se0.96(4)S1.04(5) single crystals. The upper critical fields Hc2(T) for both field directions decrease with the increase in S content. On the other hand, the angle-dependent magnetoresistivity for both compounds can be scaled onto one curve using the anisotropic Ginzburg-Landau theory. The obtained anisotropy of Hc2(T) increases with S content, implying that S doping might decrease the dimensionality of certain Fermi surface parts, leading to stronger two dimensional character.

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