Magnetization Plateaus in NH4CuCl3

Wakako Shiramura, Ken Ichi Takatsu, Budhy Kurniawan R., Hidekazu Tanaka, Hidehiro Uekusa, Yuji Ohashi, Kohichi Takizawa, Hiroyuki Mitamura, Tsuneaki Goto

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164 Citations (Scopus)

Abstract

The magnetic susceptibility and high-field magnetization process of NH4CuCl3 with double chains of CuCl3 have been measured using single crystals. No anomaly indicative of the three-dimensional ordering is observed in susceptibility data above 1.7 K. It is found, by magnetization measurement down to 0.5 K, that in contrast to KCuCl3 and TlCuCl3, NH4CuCl3 has a gapless magnetic ground state at zero field. It is observed that the magnetization curve has two plateaus at one-quarter and three-quarters of the saturation magnetization, irrespective of the external field direction. The origin of the plateaus is attributed not to the magnetic anisotropy, but to the quantum effect. The relation between the plateaus and the period of the spin state is discussed in terms of a recent theory presented by Oshikawa et al. [Phys. Rev. Lett. 78 (1997) 1984].

Original languageEnglish
Pages (from-to)1548-1551
Number of pages4
JournalJournal of the Physical Society of Japan
Volume67
Issue number5
DOIs
Publication statusPublished - 1 Jan 1998

Keywords

  • Double chain
  • High field
  • Magnetization plateaus
  • Magnetization process
  • NHCuCl

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