Journal of Low Temperature Physics

, Volume 131, Issue 3–4, pp 239–243 | Cite as

Interplay Between Spin and Charge Excitations in the Coupled Spin-Pseudospin Systems

  • Y. Ohta
  • S. Ejima
  • T. Nakaegawa


A coupled spin-pseudospin Hamiltonian in one-dimension (1D) that models the charge-ordering instability of the anisotropic Hubbard ladder at quarter filling is studied by the quantum Monte Carlo and density-matrix renormalization group methods. We show that there is a parameter and temperature region where the spin degrees of freedom are separated from the charge degrees of freedom and behave like a 1D antiferromagnetic Heisenberg model. Anomalous behaviors observed in the disorder phase of α′-NaV2O5 may be due to the spin-charge coupling in the present model.


Temperature Region Magnetic Material Present Model Renormalization Group Group Method 
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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • Y. Ohta
    • 1
    • 2
  • S. Ejima
    • 2
  • T. Nakaegawa
    • 2
  1. 1.Department of PhysicsChiba UniversityChiba 2Japan
  2. 2.Graduate School of Science and TechnologyChiba UniversityChibaJapan

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