Modified spin-wave study of random antiferromagnetic-ferromagnetic spin chains

Xin Wan, Kun Yang, R. N. Bhatt

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

We study the thermodynamics of a one-dimensional quantum spin-1/2 Heisenberg ferromagnetic system with random antiferromagnetic impurity bonds. In the dilute impurity limit, we generalize the modified spin-wave theory for random spin chains, where local chemical potentials for spin waves in ferromagnetic spin segments are introduced to ensure zero magnetization at finite temperature. This approach successfully describes the crossover from the behavior of a pure one-dimensional ferromagnet at high temperatures to a distinct Curie behavior due to randomness at low temperatures. We discuss the effects of impurity bond strength and concentration on the crossover and low-temperature behavior.

Original languageEnglish (US)
Article number014429
Pages (from-to)144291-1442910
Number of pages1298620
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number1
DOIs
StatePublished - Jul 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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