Phase diagram of the frustrated asymmetric ferromagnetic spin ladder

  • Lihua Pan
  • Depeng Zhang
  • Hsiang-Hsuan Hung
  • Yong-Jun Liu
Regular Article

DOI: 10.1140/epjb/e2017-70716-5

Cite this article as:
Pan, L., Zhang, D., Hung, HH. et al. Eur. Phys. J. B (2017) 90: 105. doi:10.1140/epjb/e2017-70716-5

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.

Keywords

Solid State and Materials 

Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Lihua Pan
    • 1
  • Depeng Zhang
    • 1
  • Hsiang-Hsuan Hung
    • 2
  • Yong-Jun Liu
    • 1
  1. 1.School of Physics Science and Technology, Yangzhou UniversityYangzhouP.R. China
  2. 2.Department of PhysicsThe University of TexasAustinUSA

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