High-field magnetization of the S=1/2 two-leg spin-ladder antiferromagnets CuAX2 (A=Diazine, X=Halogen)

M. Ikeda, Z. Honda, M. Sakai, S. Kimura, K. Okunishi, M. Hagiwara

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We have performed magnetic susceptibility and high-field magnetization measurements on powder samples of Cu(DEP)Br2 (DEP=2,3-diethyl- pyrazine) and Cu(DMP)Cl2 (DMP=2,3-dimethyl-pyrazine) which are regarded as spin-1/2 two-leg spin-ladders in which the exchange constants are given by J along the leg and J ⊥ along the rung. The temperature dependences of magnetic susceptibilities of these compounds show a round peak at 11 and 18 K, respectively, and are compared with those calculated with a density matrix renormalization group method for α=J /J ⊥=0.45-0.55. The exchange constants of the former and the latter compounds are evaluated to be J/kB=16.5 K and J/kB=28.4K, respectively. No magnetization at 1.3 K appears in magnetic fields of up to about 5 T for Cu(DEP)Br 2 and about 14 T for Cu(DMP)Cl2, and then the magnetization increases monotonically to saturate at around 25 T and 38 T for respective compounds. Both magnetization curves are also compared with those calculated for α=0.45-0.55 using the same exchange parameter values as in the susceptibilities.

Original languageEnglish
Pages (from-to)296-301
Number of pages6
JournalJournal of Low Temperature Physics
Volume170
Issue number5-6
DOIs
Publication statusPublished - 2013 Mar

Keywords

  • Magnetic susceptibility
  • Magnetization
  • Quantized spin models
  • Two-leg spin-ladder

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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