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arXiv 1503.08164cond-mat.str-elcond-mat.supr-con
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由出现的磁矩产生的超导性

Superconductivity from emerging magnetic moments

Shintaro Hoshino, Philipp Werner

摘要:

多轨道哈伯德模型表现出空间各向同性自旋三重态超导相,其中不同局域轨道上的等自旋电子是成对的。这种超导状态在自旋冻结交叉制度中是稳定的,其中局部力矩出现在金属相中,并且配对基本上由自旋各向异性辅助。相图的特点是在非费米液态金属区域下方和磁有序相旁边有一个超导圆顶。我们认为,这种类型的涨落矩诱导的超导性,这是不是源于量子临界点附近的波动,可能会实现在自旋三重态超导体,如锶铼酸盐和铀化合物。

英文摘要:

Multi-orbital Hubbard models are shown to exhibit a spatially isotropic spin-triplet superconducting phase, where equal-spin electrons in different local orbitals are paired. This superconducting state is stabilized in the spin-freezing crossover regime, where local moments emerge in the metal phase, and the pairing is substantially assisted by spin anisotropy. The phase diagram features a superconducting dome below a non-Fermi liquid metallic region and next to a magnetically ordered phase. We suggest that this type of fluctuating-moment induced superconductivity, which is not originating from fluctuations near a quantum critical point, may be realized in spin-triplet superconductors such as strontium ruthenates and uranium compounds.

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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