Antiferromagnetic Heisenberg chains with bond alternation and quenched disorder

Yu Cheng Lin, Heiko Rieger, Ferenc Iglói

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We consider S = 1/2 antiferromagnetic Heisenberg chains with alternating bonds and quenched disorder, which represents a theoretical model of the compound CuCl2xBr2(1-x)(γ-pic)2. Using a numerical implementation of the strong disorder renormalization group method we study the low-energy properties of the system as a function of the concentration, x, and the type of correlations in the disorder. For perfect correlation of disorder the system is in the random dimer (Griffiths) phase having a concentration dependent dynamical exponent. For weak or vanishing disorder correlations the system is in the random singlet phase, in which the dynamical exponent is formally infinity. We discuss consequences of our results for the experimentally measured low-temperature susceptibility of CuCl 2xBr2(1-x)(γ-pic)2.

Original languageEnglish
Pages (from-to)1602-1606
Number of pages5
JournalJournal of the Physical Society of Japan
Volume73
Issue number6
DOIs
Publication statusPublished - Jun 1 2004

Keywords

  • Correlated disorder
  • CuClBr(γ-pic)
  • Low-temperature susceptibility
  • Quantum Griffiths phase
  • Random Heisenberg chain
  • Random singlet phase
  • Strong disorder renormalization group

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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