μsR study on quantum spin system NH4CUCl3

K. Matsui, A. Oosawa, K. Yoshizawa, T. Goto, I. Watanabe, T. Suzuki, M. Fujisawa, H. Tanaka, P. K. Biswas, A. Amato

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Abstract

The quantum spin dimer system NH4CuCl3 has a gapless ground state with TN 1.3 K, and shows plateaus in the high-field magnetization at 1/4 and 3/4 of the saturation magnetization, the mechanism of which has not yet been resolved until now. The three dimer model recently proposed by Matsumoto, which seems well accounting for the emergence of plateaus, predicts the existence of three magnetically-inequivalent dimers. In order to test the model, we have measured transverse-field (TF) muon depolarization curves. In fourier transform of TF muon depolarization curves, we observed homogeneous single peak at T > 100 K. Below 70 K, the peak showed rapid broadening, and split into multiple peaks in still lower temperatures, supporting the idea of the three dimer subsystems.

Original languageEnglish
Article number012007
JournalJournal of Physics: Conference Series
Volume551
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1
Event13th International Conference on Muon Spin Rotation, Relaxation and Resonance, MuSR 2014 - Grindelwald, Switzerland
Duration: 2014 Jun 12014 Jun 6

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Matsui, K., Oosawa, A., Yoshizawa, K., Goto, T., Watanabe, I., Suzuki, T., Fujisawa, M., Tanaka, H., Biswas, P. K., & Amato, A. (2014). μsR study on quantum spin system NH4CUCl3. Journal of Physics: Conference Series, 551(1), [012007]. https://doi.org/10.1088/1742-6596/551/1/012007