Electron-phonon driven spin frustration in multi-band Hubbard models: MX chains and oxide superconductors
- Naval Command, Control and Ocean Surveillance Center, San Diego, CA (United States)
- Los Alamos National Lab., NM (United States)
- 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:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10107159
- Report Number(s):
- LA-UR--92-3242; CONF-9208132--7; ON: DE93003697
- Country of Publication:
- United States
- Language:
- English
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