Spin-Triplet Pairing Induced by Hund's Rule Exchange in Orbitally Degenerate Systems: Hartree-Fock Approximation

Autor:	Jozef Spałek, M. Zegrodnik
Rok vydání:	2012
Předmět:	Physics Hubbard model Ferromagnetism Condensed matter physics Pairing Degenerate energy levels Hartree–Fock method General Physics and Astronomy Condensed Matter::Strongly Correlated Electrons Hund's rule of maximum multiplicity Spin (physics) Square lattice
Zdroj:	Acta Physica Polonica A. 121:1051-1055
ISSN:	1898-794X 0587-4246
DOI:	10.12693/aphyspola.121.1051
Popis:	We discuss the spin-triplet pairing mechanism induced by the Hund rule ferromagnetic exchange. We include explicitly the effect of interband hybridization and treat the problem by starting from an extended Hubbard model for a doubly degenerate band, making the simplest Hartree-Fock approximation for the part involving the pairing and the Hubbard interaction. The conditions of stability of various phases are determined as a function of both band filling and microscopic parameters. The phase diagram contains regions of stability of the spin-triplet superconducting phase coexisting with either saturated or non-saturated ferromagnetism. Phase diagrams for the cases of constant density of states and that of square lattice have been provided. The influence of hybridization on the stability of considered phases, as well as the temperature dependences of magnetic moment and the superconducting gap are also discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::58936977c130f660992ad2659bad2059 https://doi.org/10.12693/aphyspola.121.1051 Zobrazit plný text záznamu Plný text ve formátu PDF