Thermodynamic properties and elementary excitations in quantum sine-gordon spin system KCuGaF 6

Rieko Morisaki, Toshio Ono, Hidekazu Tanaka, Hiroyuki Nojiri

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Thermodynamic properties and elementary excitations in S = 1/2 one-dimensional Heisenberg antiferromagnet KCuGaF 6 were investigated by magnetic susceptibility, specific heat and ESR measurements. Due to the Dzyaloshinsky-Moriya interaction with alternating D-vectors and/or the staggered g-tensor, the staggered magnetic field is induced when subjected to external magnetic field. Specific heat in magnetic field clearly shows the formation of excitation gap, which is attributed to the staggered magnetic field. The specific heat data was analyzed on the basis of the quantum sine-Gordon (SG) model. We observed many ESR modes including one soliton and three breather excitations characteristic of the quantum SG model.

Original languageEnglish
Article number063706
Journaljournal of the physical society of japan
Volume76
Issue number6
DOIs
Publication statusPublished - 2007 Jun

Keywords

  • Breathers
  • Dzyaloshinsky-Moriya interaction
  • KCuGaF
  • Magnetic-field induced gap
  • One-dimensional antiferromagnet
  • Sine-Gordon model
  • Solitons
  • Staggered field

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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