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arXiv · 1409.1310

NaCuMoO_4(OH) as a Candidate Frustrated J_1-J_2 Chain Quantum Magnet

Kazuhiro Nawa·Yoshihiko Okamoto·Akira Matsuo·Koichi Kindo·Yoko Kitahara·Syota Yoshida·Shohei Ikeda·Shigeo Hara·Takahiro Sakurai·Susumu Okubo·Hitoshi Ohta·Zenji Hiroi
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Abstract

In a frustrated J_1-J_2 chain with the nearest-neighbor ferromagnetic interaction J_1 and the next-nearest-neighbor antiferromagnetic interaction J_2, novel magnetic states such as a spin-nematic state are theoretically expected. However, they have been rarely examined in experiments because of the difficulty in obtaining suitable model compounds. We show here that the quasi-one-dimensional antiferromagnet NaCuMoO_4(OH), which comprises edge-sharing CuO_2 chains, is a good candidate J_1-J_2 chain antiferromagnet. The exchange interactions are estimated as J_1 = - 51 K and J_2 = 36 K by comparing the magnetic susceptibility, heat capacity, and magnetization data with the data obtained using calculations by the exact diagonalization method. High-field magnetization measurements at 1.3 K show a saturation above 26 T with little evidence of a spin nematic state expected just below the saturation field, which is probably due to smearing effects caused by thermal fluctuations and the polycrystalline nature of the sample.

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Kazuhiro Nawa, Yoshihiko Okamoto, Akira Matsuo, Koichi Kindo, Yoko Kitahara, Syota Yoshida, Shohei Ikeda, Shigeo Hara, Takahiro Sakurai, Susumu Okubo, Hitoshi Ohta, Zenji Hiroi. 2014-09-04. NaCuMoO_4(OH) as a Candidate Frustrated J_1-J_2 Chain Quantum Magnet. https://doi.org/10.7566/jpsj.83.103702

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