Long-range orders and spin/orbital freezing in the two-band Hubbard model

被引：26

作者：

Steiner, Karim ^{[1
]}

Hoshino, Shintaro ^{[2
]}

Nomura, Yusuke ^{[3
]}

Werner, Philipp ^{[1
]}

机构：

[1] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland

[2] Univ Tokyo, Dept Basic Sci, Meguro Ku, Tokyo 1538902, Japan

[3] Univ Paris Saclay, CNRS, Ecole Polytech, Ctr Phys Theor, F-91128 Palaiseau, France

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 07期

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

INFINITE DIMENSIONS; ORBITAL DEGENERACY; SUPERCONDUCTIVITY; FERROMAGNETISM; SYSTEMS;

D O I：

10.1103/PhysRevB.94.075107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We solve the orbitally degenerate two-band Hubbard model within dynamical mean field theory and map out the instabilities to various symmetry-broken phases based on an analysis of the corresponding lattice susceptibilities. Phase diagrams as a function of the Hund coupling parameter J are obtained both for the model with rotationally invariant interaction and for the model with Ising-type anisotropy. For negative J, an intraorbital spin-singlet superconducting phase appears at low temperatures, while the normal state properties are characterized by an orbital-freezing phenomenon. This is the negative-J analog of the recently discovered fluctuating-moment induced s-wave spin-triplet superconductivity in the spin-freezing regime of multiorbital models with J > 0.

引用

页数：8

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