ESR study of sine-Gordon excitations in S = 1/2 antiferromagnetic chain: Copper benzoate

Takayuki Asano, Hiroyuki Nojiri, Yuji Inagaki, Takuo Sakon, Jean Paul Boucher, Yoshitami Ajiro, Mitsuhiro Motokawa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We investigate electron spin resonance (ESR) on Cu benzoate, Cu(C 6H5COO)2 · 3H2O, which is an ideal model substance of S = 1/2 antiferromagnetic Heisenberg chain (AFHC) with staggered field. Theoretically, S = 1/2 AFHC subjected to the staggered field exemplifies a good realization of a quantum sine-Gordon (SG) model. In fact, under magnetic fields, this compound develops an energy gap Eg(H) in the low-lying SG excitation spectra as a function of the applied magnetic field H. In the previous work, we observed the SG-breather excitation for the first time, in wide-field range up to 30 T by means of ESR under Faraday configuration. In this work, we report a direct observation of the SG-soliton/antisoliton excitation by ESR under Voigt configuration. Thus, all solutions of the SG equation are now experimentally demonstrated by means of ESR technique.

Original languageEnglish
Pages (from-to)1213-1214
Number of pages2
JournalPhysica B: Condensed Matter
Issue numberII
Publication statusPublished - 2003 May


  • Cu benzoate
  • ESR
  • Field-induced gap
  • Quantum spin


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