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arXiv 1507.04823cond-mat.supr-con
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Rb0 1.6 + xSe2超导体的超导圆顶和微结构特性

Superconducting dome and microstructure properties of Rb0.8Fe1.6+xSe2 superconductors

Zhiwei Wang, Zhen Wang, Yao Cai, Zhen Chen, Chao Ma, Huaixin Yang, Jianqi Li

摘要:

采用一步熔融法生长出高质量的Rb_(0.8)Fe_(1.6 + x)Se_2单晶。在x> 0.05的所有样品中都观察到了超导电性,在x为0.1 ~ 0.2的样品中测得最大临界温度Tc~32 K。在AxFeySe_2(A=K,Rb)超导体系中,首次观察到Tc随Fe含量变化的电子相图中的超导圆顶。在所有超导样品中观察到结构调制矢量为q1=1/5 [3a*+b*]和q2=1/2[a*+b*]的两相共存。此外,在超导晶体中的相分离,这可以被认为是在ab平面的微条纹,被发现是高度依赖于Fe含量。

英文摘要:

High quality Rb0.8Fe1.6+xSe2 single crystals are grown by a one step melting growth method. Superconductivity has been observed in all samples with x more than 0.05 and the maximum critical temperature Tc~32 K has been obtained in samples with x from 0.1 to 0.2 from electronic resistivity measurement. A superconducting dome in the electronic phase diagram of Tc as a function of Fe content has been observed for the first time in this AxFeySe2 (A=K,Rb) superconducting system. Two coexisting phases with structural modulation vectors of q1=1/5 [3a*+b*] and q2=1/2[a*+b*] have been observed in all superconducting samples by TEM observations. Moreover, phase separation in the superconducting crystals, which can be recognized as micro-stripes in the ab plane, are found to be highly dependent on the Fe content.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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