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Magnetization plateau and quantum phase transitions in a spin-orbital model

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Abstract.

A spin-orbital chain with different Landé g factors and one-ion anisotropy is studied in the context of the thermodynamical Bethe ansatz. It is found that there exists a magnetization plateau resulting from the different Landé g factors. Detailed phase diagram in the presence of an external magnetic field is presented both numerically and analytically. For some values of the anisotropy, the four-component system undergoes five consecutive quantum phase transitions when the magnetic field varies. We also study the magnetization in various cases, especially its behaviors in the vicinity of the critical points. For the SU(4) spin-orbital model, explicit analytical expressions for the critical fields are derived, with excellent accuracy compared with numerics.

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Authors and Affiliations

  1. Department of Physics, Hangzhou Teachers College, 310012, Hangzhou, P.R. China

    Zu-Jian Ying & Bin Chen

  2. Instituto de Física da UFRGS, Av. Bento Gonçalves 9500, 91501-970, Porto Alegre, Brazil

    Zu-Jian Ying & Angela Foerster

  3. Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180, Rio de Janeiro, RJ, Brazil

    Zu-Jian Ying & Itzhak Roditi

  4. Department of Theoretical Physics, Research School of Physical Sciences and Engineering, and Centre for Mathematics and its Applications, Mathematical Sciences Institute, Australian National University, ACT 0200, Canberra, Australia

    Xi-Wen Guan

Authors
  1. Zu-Jian Ying
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  2. Angela Foerster
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  3. Xi-Wen Guan
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  4. Bin Chen
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  5. Itzhak Roditi
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Corresponding author

Correspondence to Zu-Jian Ying.

Additional information

Received: 8 January 2004, Published online: 8 June 2004

PACS:

75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) - 71.27. + a Strongly correlated electron systems; heavy fermions - 75.10.Jm Quantized spin models

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Ying, ZJ., Foerster, A., Guan, XW. et al. Magnetization plateau and quantum phase transitions in a spin-orbital model. Eur. Phys. J. B 38, 535–539 (2004). https://doi.org/10.1140/epjb/e2004-00149-2

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  • DOI: https://doi.org/10.1140/epjb/e2004-00149-2

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