Spontaneous magnetization in unitary superconductors with time reversal symmetry breaking

被引：7

作者：

Hu, Lun-Hui ^{[1
]}

Wang, Xuepeng ^{[2
]}

Shang, T. ^{[3
]}

机构：

[1] Penn State Univ, Dept Phys, State Coll, PA 16802 USA

[2] Nanjing Univ, Sch Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[3] East China Normal Univ, Sch Phys & Elect Sci, Key Lab Polar Mat & Devices MOE, Shanghai 200241, Peoples R China

来源：

PHYSICAL REVIEW B | 2021年 / 104卷 / 05期

基金：

上海市自然科学基金;

关键词：

FERROMAGNETISM; PHASES;

D O I：

10.1103/PhysRevB.104.054520

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the study of spontaneous magnetization (i.e., spin polarization) for time-reversal-symmetrybreaking (TRS-breaking) superconductors with unitary pairing potentials, in the absence of external magnetic fields or Zeeman fields. Spin-singlet (Delta(s)) and spin-triplet (Delta(t)) pairings can coexist in superconductors whose crystal structures lack inversion symmetry. The TRS can be spontaneously broken once a relative phase of +/- pi/2 is developed, forming a TRS-breaking unitary pairing state (Delta(s) +/- i Delta(t)). We demonstrate that such unitary pairing could give rise to spontaneous spin polarization with the help of spin-orbit coupling. Our result provides an alternative explanation for the TRS breaking, beyond the current understanding of such phenomena in the noncentrosymmetric superconductors. The experimental results of Zr3Ir and CaPtAs are also discussed in view of our theory.

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页数：7

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