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

Steiner, Karim; Hoshino, Shintaro; Nomura, Yusuke; Werner, Philipp

doi:10.1103/PhysRevB.94.075107

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Journal article

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

Steiner, Karim Department of Physics, University of Fribourg, Switzerland
Hoshino, Shintaro Department of Basic Science, The University of Tokyo, Meguro, Tokyo, Japan
Nomura, Yusuke Centre de Physique Théorique, École Polytechnique, Centre National de la Recherche Scientifique, Université Paris-Saclay, Palaiseau, France
Werner, Philipp Department of Physics, University of Fribourg, Switzerland

03.08.2016

Published in:

Physical Review B. - 2016, vol. 94, no. 7, p. 075107

English 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.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

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