Accession Number : ADA264688


Title :   Electron-Phonon Driven Spin Frustration in Multi-Band Hubbard Models: MX Chains and Oxide Superconductors


Descriptive Note : Professional paper


Corporate Author : NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA


Personal Author(s) : Gammel, J T ; Yonemitsu, K ; Saxena, A ; Bishop, A R ; Roder, H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264688.pdf


Report Date : Mar 1993


Pagination or Media Count : 8


Abstract : We discuss the consequence of both electron-phonon and electron- electron couplings in 1D and 2D multiband (Peierls- Hubbard) model. After briefly discussing various analytic limits, we focus on (Hartree- Fock and exact) numerical studies in the intermediate regime for both couplings, where unusual spin-Peierls as well as long-period, 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. We discuss 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. Electron-phonon, Electron-electron couplings, Bipolaronic, Halogen-bridged.


Descriptors :   *PHONONS , *SPIN STATES , LINEAR SYSTEMS , METALS , TRANSITION METALS , MODELS , PHASE TRANSFORMATIONS , TWO DIMENSIONAL , HIGH TEMPERATURE , EXCITATION , SUPERCONDUCTORS , ONE DIMENSIONAL , SINGLE CRYSTALS , HOLES(ELECTRON DEFICIENCIES) , PHASE , BOUNDARIES , OXIDES , COPPER , CHAINS , HARTREE FOCK APPROXIMATION , MOLECULAR ORBITALS , EXCITONS , COUPLINGS , HALOGENS , DIAGRAMS , PHASE DIAGRAMS , SEPARATION , TRANSITIONS , DOPING


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Solid State Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE