Superconductivity induced by La doping in Sr1-xLaxFBiS2
Superconductivity induced by La doping in Sr1-xLaxFBiS2
复制标题
Sr1-xLaxFBiS2 中 La 掺杂诱导的超导
DOI：
10.1103/physrevb.87.020504
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发表时间：
2013-01-09
影响因子：
3.7
通讯作者：
Xu, Zhuan
中科院分区：
文献类型：
--
作者：
Lin, Xi;Ni, Xinxin;Xu, Zhuan
通过X射线衍射、电输运、磁化率和热容测量相结合的方法，我们报道了La掺杂对新发现的SrFBiS2系统中锶的影响。在Sr0.5La0.5FBiS2中发现了超导转变，其临界温度T-c为2.8K，由类半导体正常态发展而来。观察到了强烈的抗磁信号和与此转变相关的明显的比热异常，证实了块体超导电性。用Ginzburg-Landau方法估算了上临界场H-c2(0)为1T。因此，我们的实验证明在SrFBiS2系统中可以通过电子掺杂来实现大块超导电性。DOI：10.1103/PhysRevB.87.020504
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 T-c 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 H-c2(0) was estimated to be 1 T by using the Ginzburg-Landau approach. Our experiments therefore demonstrate that bulk superconductivity can be achieved by electron doping in the SrFBiS2 system. DOI: 10.1103/PhysRevB.87.020504