Coexistence of gap-less and gapped excitations in NH4CuCl 3

Hiroyuki Nojiri, Hidekazu Tanaka, Buddy Kurniawan, Mitsuhiro Motokawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A low-temperature ESR investigation is performed on a low-dimensional compound NH4CuCl3 with magnetization plateaux. In the phase below the 1/4-plateau, a coexistence of gapped two triplets and a gap-less mode is found. Below 1.3 K at which a part of spins show some magnetic ordering, the higher energy triplet mode exhibit no change. In addition to the previously reported gapped modes at 1/4- and 3/4- plateaux, a new low energy mode is found at the half of the saturation field. This mode may be caused by an 'irrelevant instability' of 1/2-plateau.

Original languageEnglish
Pages (from-to)701-702
Number of pages2
JournalPhysica B: Condensed Matter
Issue numberII
Publication statusPublished - May 2003


  • Electron spin resonance
  • High magnetic field
  • Magnetization plateau
  • Spin gap


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