Superconductivity at 32 K in single crystal Rb$_{0.78}$Fe$_2$Se$_{1.78}$}

A. F. Wang; G. J. Ye; J. J. Ying; M. Zhang; P. Cheng; R. H. Liu; X. F. Wang; X. G. Luo; X. H. Chen; Y. J. Yan

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arxiv 1012.5525 v1 pith:YMT3KLZB submitted 2010-12-26 cond-mat.supr-con

Superconductivity at 32 K in single crystal Rb_(0.78)Fe₂Se_(1.78)}

A. F. Wang , J. J. Ying , Y. J. Yan , R. H. Liu , X. G. Luo , Z. Y. Li , X. F. Wang , M. Zhang

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G. J. Ye P. Cheng Z. J. Xiang X. H. Chen

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keywords fieldresistivitycrystalsinglesuperconductingtransitionanisotropyaround

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We successfully grew the high-quality single crystal of Rb$_{0.78}$Fe$_2$Se$_{1.78}$, which shows sharp superconducting transition in magnetic susceptibility and electrical resistivity. Resistivity measurements show the onset superconducting transition ($T_{\rm c}$) at 32.1 K and zero resistivity at 30 K. From the low-temperature iso-magnetic-field magnetoresistance, large upper critical field $H_{\rm c2}$(0) has been estimated as high as 180 T for in-plane field and 59 T for out-of-plane field. The anisotropy $H^{ab}_{\rm c2}$(0)/$H^{c}_{\rm c2}$(0) is around 3.0, right lying between those observed in K$_x$Fe$_2$Se$_2$ and Cs$_x$Fe$_2$Se$_2$.

Superconductivity at 32 K in single crystal Rb_(0.78)Fe₂Se_(1.78)}

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