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Phase diagram of the frustrated asymmetric ferromagnetic spin ladder

Author

Listed:
  • Lihua Pan

    (School of Physics Science and Technology, Yangzhou University)

  • Depeng Zhang

    (School of Physics Science and Technology, Yangzhou University)

  • Hsiang-Hsuan Hung

    (The University of Texas)

  • Yong-Jun Liu

    (School of Physics Science and Technology, Yangzhou University)

Abstract

We present a systematic investigation on the ground state of an asymmetric two-leg spin ladder (where exchange couplings of the legs are unequal) with ferromagnetic (FM) nearest-neighbor interaction and diagonal anti-ferromagnetic frustration using the density matrix renormalization group method. When the ladder is strongly asymmetric with moderate frustration, a magnetic canted state is observed between an FM state and a singlet dimerized state. The phase boundaries are dependent on the asymmetric strength. On the other hand, when the asymmetric strength is intermediate, a so-called spin-stripe state (spins align parallel on the same legs, but antiparallel on rungs) is discovered, and the system experiences a first-order phase transition from the FM state to the spin-stripe state upon increasing frustration. Numerical evidence is presented for interpretation of the phase diagram in terms of frustration and the asymmetric strength.

Suggested Citation

  • Lihua Pan & Depeng Zhang & Hsiang-Hsuan Hung & Yong-Jun Liu, 2017. "Phase diagram of the frustrated asymmetric ferromagnetic spin ladder," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 90(6), pages 1-8, June.
  • Handle: RePEc:spr:eurphb:v:90:y:2017:i:6:d:10.1140_epjb_e2017-70716-5
    DOI: 10.1140/epjb/e2017-70716-5
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    Keywords

    Solid State and Materials;

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