Neutron Scattering Study in Breathing Pyrochlore Antiferromagnet Ba3Yb2Zn5O11

T. Haku, M. Soda, M. Sera, K. Kimura, J. Taylor, S. Itoh, T. Yokoo, Y. Matsumoto, D. Yu, R. A. Mole, T. Takeuchi, S. Nakatsuji, Y. Kono, T. Sakakibara, L. J. Chang, T. Masuda

研究成果: Conference article

摘要

Inelastic neutron scattering (INS) study on breathing pyrochlore antiferromagnet Ba3Yb2Zn5O11 is presented. Observed crystalline electric field (CEF) excitations are explained by a Hamiltonian of Kramers ion Yb3+ of which the local symmetry exhibits C3v point group symmetry. The magnetic susceptibility is consistently reproduced by the energy scheme of the CEF excitations. The INS spectra in the low-energy range are quantitatively explained by spin-1/2 single-tetrahedron model having XXZ anisotropy and Dzyaloshinskii-Moriya interaction. This model has a two-fold degeneracy of the lowest-energy state per tetrahedron and well reproduces the bulk properties at T ≥ 0.5K. At lower temperatures, however, we observe a broad maximum in the heat capacity around 63 mK, demonstrating that a unique quantum ground state is selected due to extra perturbations.

原文English
文章編號012018
期刊Journal of Physics: Conference Series
828
發行號1
DOIs
出版狀態Published - 2017 四月 20
事件8th International Conference on Highly Frustrated Magnetism 2016, HFM 2016 - Taipei, Taiwan
持續時間: 2016 九月 72016 九月 11

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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