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A Two Band Model for Halogen-Bridged Transition Metal Linear Chain Complexes

  • A. R. Bishop
  • J. Tinka Gammel
  • E. Y. LohJr.
  • S. R. Phillpot
  • S. M. Weber-Milbrodt
Part of the NATO ASI Series book series (NSSB, volume 213)

Abstract

Halogen-bridged transition-metal complexes have been of interest to chemists for many decades as dyes and strongly dichroic materials [1]. However they have only recently begun to receive detailed consideration in the physics community [2–8]. Their potential importance arises because of:
  1. (i)

    The increasing appreciation of strong, competing electron-electron and electron-phonon interactions in low-dimensional materials and the consequent need to expand many-body techniques. The MX materials offer a rapidly expanding, near single-crystal (in contrast to, e.g., polyacetylene), class of quasi-1-D systems which can be “tuned” (by chemistry, pressure, doping, etc.) between various ground state extremes: from strong charge-disproportionation and large lattice distortion (e.g., ~ 20% distortion in PtCl) to weak charge-density-wave and small lattice distortion (e.g., ~ 5% distortion in PtI), to magnetic and undistorted (e.g., NiBr);

     
  2. (ii)

    The opportunity to probe doping- and photo-induced local defect states (polarons, bipolarons, kinks, excitons) and their interactions in controlled environments and the same large range of ground states; and

     
  3. (iii)

    The similarities between models and theoretical issues in these materials and the recently discovered oxide superconductors [3]. The MX materials are also closely connected conceptually with mixed-stack charge-transfer salts [9].

     

Keywords

Optical Absorption Spectrum Exact Diagonalization Synthetic Metal Period Phase Site Ring 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • A. R. Bishop
    • 1
  • J. Tinka Gammel
    • 1
  • E. Y. LohJr.
    • 1
  • S. R. Phillpot
    • 2
  • S. M. Weber-Milbrodt
    • 3
  1. 1.Theoretical DivisionLos Alamos National LaboratoryLos AlamosUSA
  2. 2.Materials Science DivisionArgonne National LaboratoryArgonneUSA
  3. 3.Physikalisches InstitutUniversität BayreuthW. Germany

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