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arXiv 1702.08304cond-mat.supr-con
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掺杂BaCoSO超导电性的理论研究

Theoretical studies of superconductivity in doped BaCoSO

Shengshan Qin, Yinxiang Li, Qiang Zhang, Congcong Le, Jiangping Hu

摘要:

我们研究了掺杂BaCoSO(一种具有强反铁磁基态的多轨道莫特绝缘体)中可能存在的超导电性。用平均场方法和无规相近似(RPA)方法研究了t-J型和Hubbard型多轨道模型下的超导性。即使不存在C4旋转对称性,系统仍然具有d波型的配对对称态,在费米面上具有无带隙节点和变号的超导序参量.结果在很大程度上是掺杂不敏感的。在这种超导状态下,三个t2 g轨道在动量空间中具有非常不同的超导形状因子。特别地,dx 2-y2轨道的眶内配对具有s波样配对形状因子。这两种方法还预测了费米面不同部位的对强度,这些结果表明BaCoSO及相关材料可以成为检验和建立非常规高温超导基本原理的新基础。

英文摘要:

We investigate superconductivity that may exist in the doped BaCoSO, a multi-orbital Mott insulator with a strong antiferromagnetic ground state. The superconductivity is studied in both t-J type and Hubbard type multi-orbital models by mean field approach and random phase approximation (RPA) analysis. Even if there is no C4 rotational symmetry, it is found that the system still carries a d-wave like pairing symmetry state with gapless nodes and sign changed superconducting order parameters on Fermi surfaces. The results are largely doping insensitive. In this superconducting state, the three t2g orbitals have very different superconducting form factors in momentum space. In particular, the intra-orbital pairing of the dx2-y2 orbital has a s-wave like pairing form factor. The two methods also predict very different pairing strength on different parts of Fermi surfaces.These results suggest that BaCoSO and related materials can be a new ground to test and establish fundamental principles for unconventional high temperature superconductivity.

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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