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Superconductivity induced by La doping in Sr1-xLaxFBiS2 system

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arxiv 1301.2380 v1 pith:APVHKPNC submitted 2013-01-11 cond-mat.supr-con

Xi Lin , Xinxin Ni , Bin Chen , Xiaofeng Xu , Xuxin Yang , Jianhui Dai , Yuke Li , Xiaojun Yang
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Yongkang Luo Qian Tao Guanghan Cao Zhuan Xu
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classification cond-mat.supr-con
keywords dopingsuperconductivitysystembulkcriticalheatsrfbis2transition
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Through a combination of X-ray diffraction, electrical transport, magnetic susceptibility, and heat capacity measurements, we report the effect of La doping on Sr in the newly discovered SrFBiS2 system. Superconducting transition with critical temperature Tc of 2.8 K, developed from a semiconducting-like normal state, was found in Sr0.5La0.5FBiS2. A strong diamagnetic signal and a clear specific heat anomaly associated with this transition were observed, confirming bulk superconductivity. The upper critical field Hc2(0) was estimated to be 1 Tesla by using the Ginzburg-Landau approach. Our experiments therefore demonstrate that bulk superconductivity can be achieved by electron doping in the SrFBiS2 system.

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