Steiner, Karim Hoshino, Shintaro Nomura, Yusuke Werner, Philipp 2016-08-03 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. application/pdf https://folia.unifr.ch/global/documents/305087 https://folia.unifr.ch/documents/305087/files/wer_lro.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.94.075107 info:eu-repo/semantics/openAccess License undefined Physical Review B. - 2016, vol. 94, no. 7, p. 075107 info:eu-repo/classification/udc/53 Long-range orders and spin/orbital freezing in the two-band Hubbard model http://purl.org/coar/resource_type/c_6501