ESR study of the opening and closing of the field-induced gap in NH4CuCl3

B. Kurniawan, H. Tanaka, K. Takatsu, W. Shiramura, T. Fukuda, H. Nojiri, M. Motokawa

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35 Citations (Scopus)


ESR measurements in the double-chain compound NH4CuCl3which has magnetization plateaus at one-quarter and three-quarters of the saturation magnetization, have been performed in magnetic fields up to 30 T in the frequency range ˜95–762GHz. It is found that the frequency versus field diagrams for H|a and H|b coincide when normalized by the g factors. In each plateau region, a pair of excitations expressed as ω=γ(H-Hlc) and ω=γ(Hhc-H) are observed, where Hlc and Hhc are the lower and higher edge fields of the plateau, respectively. These two modes correspond to the quantum gap in the lower- and higher-field halves in the plateau region.

Original languageEnglish
Pages (from-to)1281-1284
Number of pages4
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 1999


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