Anomalous magnetization of two-dimensional S = 1/2 frustrated square-lattice antiferromagnet (CuCl)LaNb2O7

H. Kageyama, J. Yasuda, T. Kitano, K. Totsuka, Y. Narumi, M. Hagiwara, K. Kindo, Y. Baba, N. Oba, Y. Ajiro, K. Yoshimura

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31 Citations (Scopus)

Abstract

High-field magnetization measurements have been performed up to 56 T for a two-dimensional S = 1/2 frustrated square-lattice antiferromagnet (CuCl)LaNb2O7, a recently discovered spin gap system (Δ/kB = 26:7 K). It is found that the spin gap closes at a surprisingly low field Hc1 = 10.3 T compared with that expected from the zero-field spin gap (Δ/gμB = 18.4 T). For H > H c1, the magnetization exhibits a linear increase without any trace of anomalies such as fractional plateaus until it saturates at Hc2 = 30:1 T. This means that the gapless phase, where the field-induced magnetic ordering is expected to occur at low temperatures, is stable over a wide field region. These results suggest strong correlations of triplet excitations in the layer and the proximity of the spin-liquid phase to the magnetically ordered phase.

Original languageEnglish
Pages (from-to)3155-3158
Number of pages4
Journaljournal of the physical society of japan
Volume74
Issue number12
DOIs
Publication statusPublished - 2005 Dec 1

Keywords

  • (CuCl)LaNbO
  • Bound state
  • Ion-exchange reaction
  • J-J model
  • Magnetization
  • Spin liquid
  • Square lattice

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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