Superconductivity from Emerging Magnetic Moments
Superconductivity from Emerging Magnetic Moments
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DOI：
10.1103/physrevlett.115.247001
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发表时间：
2015-12-08
影响因子：
8.6
通讯作者：
Werner, Philipp
中科院分区：
文献类型：
--
作者：
Hoshino, Shintaro;Werner, Philipp
多轨道Hubbard模型显示了空间各向同性的自旋三重态超导相，其中不同局域轨道上的等自旋电子配对。这种超导态稳定在自旋冻结的交叉区，在该交叉区，金属相中出现局部力矩，而这种配对基本上是由自旋各向异性辅助的。相图的特点是在非费米液态金属区域下方和磁性有序相旁边有一个超导穹顶。我们认为，这种不是由量子临界点附近的涨落引起的脉动矩诱导的超导电性，可以在自旋三重态超导体中实现，如锶和铀化合物。
Multiorbital 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.