Electron-phonon driven spin frustration in multi-band Hubbard models: MX chains and oxide superconductors

Conference · Wed Jan 01 04:00:00 EST 1992

DOI:https://doi.org/10.1016/0379-6779(93)90131-F· OSTI ID:6990343

Gammel, J T ^[1]; Yonemitsu, K; Saxena, A; Bishop, A R ^[2]; Roeder, H ^[3]

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1. Naval Command, Control and Ocean Surveillance Center, San Diego, CA (United States)
2. Los Alamos National Lab., NM (United States)
3. Bayreuth Univ. (Germany). Physics Inst.

We discuss the consequences of both electron-phonon and electron-electron couplings in 1D and 2D multi-band (Peierls-Hubbard) models are discussed. After a brief discussion of various analytic limits, we focused on (Hartree-Fock and exact) numerical studies in the intermediate regime for both couplings, where unusual spin-Peierls as well as long-period, frustrated ground states are found. Doping into such phases or near the phase boundaries can lead to further interesting phenomena such as separation of spin and charge, a dopant-induced phase transition of the global (parent) phase, or real-space ( bipolaronic'') pairing. Possible experimentally observable consequences of this rich phase diagram for halogen-bridged, transition metal, linear chain complexes (MX chains) in 1D and the oxide superconductors in 2D are discussed.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6990343
• Report Number(s): LA-UR-92-3242; CONF-9208132--7; ON: DE93003697
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
BAND THEORY
COUPLING
CRYSTAL DOPING
ELECTRON-PHONON COUPLING
HAMILTONIANS
HIGH-TC SUPERCONDUCTORS
MATHEMATICAL OPERATORS
PARTICLE PROPERTIES
PHASE STUDIES
QUANTUM OPERATORS
SPIN
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS