Jahn{endash}Teller effects in the doubly degenerate Hubbard model

Journal Article · Mon Mar 31 23:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365184· OSTI ID:496505

Lin, H Q ^[1]

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1. Department of Physics, The Chinese University of Hong Kong, Sha Tin (Hong Kong)

We investigate the Jahn{endash}Teller (JT) effects in the doubly degenerate Hubbard model by using the exact diagonalization (Lancz{umlt o}s algorithm) technique. This is in connection with the newly discovered {open_quotes}colossal magnetoresistance{close_quotes} perovskite-based La{sub 1{minus}x}A{sub x}MnO{sub 3} compounds. We first obtain the parameter region where the ground state of the doubly degenerate Hubbard model is ferromagnetically ordered analytically for a dimer, and numerically for larger clusters. Then the effects of static JT distortion in the magnetic ordering of the model are studied numerically. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496505
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
DIMERS
ELECTRON-PHONON COUPLING
FERROMAGNETIC MATERIALS
FERROMAGNETISM
HUBBARD MODEL
JAHN-TELLER EFFECT
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MANGANESE OXIDES
NUMERICAL SOLUTION
STRONTIUM COMPOUNDS