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Nearly isotropic upper critical fields in a SrFe_(1.85)Co_(0.15)As₂ single crystal

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arxiv 1001.4310 v1 pith:WKQMUZFV submitted 2010-01-25 cond-mat.supr-con

Nearly isotropic upper critical fields in a SrFe_(1.85)Co_(0.15)As₂ single crystal

classification cond-mat.supr-con
keywords temperaturetextitcriticalcrystalisotropicnearlysinglesrfe
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We study temperature dependent upper critical field $H_{\rm c2}$ of a SrFe$_{1.85}$Co$_{0.15}$As$_{2}$ single crystal (\textit{T$_c$}=20.2 K) along \textit{ab}-plane and \textit{c}-axis through resistivity measurements up to 50 T. For the both crystalline directions, $H_{\rm c2}$ becomes nearly isotropic at zero temperature limit, reaching $\sim$ 48 T. The temperature dependence of the $H_{\rm c2}$ curves is explained by interplay between orbital and Pauli limiting behaviors combined with the two band effects.

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