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.
|ジャーナル||Journal of Physics: Conference Series|
|出版ステータス||Published - 2014|
|イベント||13th International Conference on Muon Spin Rotation, Relaxation and Resonance, MuSR 2014 - Grindelwald, Switzerland|
継続期間: 2014 6月 1 → 2014 6月 6
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