1H-NMR Study of Spin-1/2 Triple-chain Magnet Cu3(OH)4MoO4

Kohei Nakagawa, Yutaka Fujii, Shin-ya Takada, Masashi Fujisawa, Hikomitsu Kikuchi

doi:10.1016/j.phpro.2015.12.075

AbstractWe have studied a natural mineral Cu3(OH)4MoO4 (mineral name: szenicsite), which is characterized as S = 1/2 triple-chain antiferromagnet, by measurements of the magnetic susceptibility χ and 1H-NMR in order to determine the low temperature magnetic state from a microscopic viewpoint. χ(T) was fitted fairly well by the sum of isolated uniform antiferromagnetic chains and a small amount of paramagnetic impurities. The width of 1H-NMR spectrum increased with decreasing temperature, suggesting inhomogeneous broadening due to impurity moments. The shift of the spectrum showed a maximum at approximately 70K and continuously decreased with decreasing temperature to the lowest temperature of 1.5K. 1D nature of this compound was also suggested from temperature and field dependences of the nuclear spin-lattice relaxation time T1. We also found that the nuclear spin-spin relaxation time T2 depended on the RF pulse power, which suggests that a relaxation process among proton spins contributes significantly to the T2. No magnetic long-range ordering was found. These results suggest that the intrinsic magnetic properties of Cu3(OH)4MoO4 in the temperature range down to 1.5K are close to those of uniform antiferromagnetic chains without a spin gap.

1H-NMR Study of Spin-1/2 Triple-chain Magnet Cu3(OH)4MoO4

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