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

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

doi:10.1103/PhysRevB.83.060512

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

Superconductivity 2011-03-02 v1

Authors: A. F. Wang , J. J. Ying , Y. J. Yan , R. H. Liu , X. G. Luo , Z. Y. Li , X. F. Wang , M. Zhang , G. J. Ye , P. Cheng , Z. J. Xiang , X. H. Chen

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Abstract

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 $_2$ .

Keywords

superconductivity Rb0.78Fe2Se1.78 single crystal critical temperature upper critical field anisotropy iron-based superconductor

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@article{arxiv.1012.5525,
  title  = {Superconductivity at 32 K in single crystal Rb$_{0.78}$Fe$_2$Se$_{1.78}$}},
  author = {A. F. Wang and J. J. Ying and Y. J. Yan and R. H. Liu and X. G. Luo and Z. Y. Li and X. F. Wang and M. Zhang and G. J. Ye and P. Cheng and Z. J. Xiang and X. H. Chen},
  journal= {arXiv preprint arXiv:1012.5525},
  year   = {2011}
}

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5 pages, 5 figs

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

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