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

Research output: Contribution to journalConference articlepeer-review

Abstract

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.

Original languageEnglish
Article number012018
JournalJournal of Physics: Conference Series
Volume828
Issue number1
DOIs
Publication statusPublished - 2017 Apr 20
Event8th International Conference on Highly Frustrated Magnetism 2016, HFM 2016 - Taipei, Taiwan
Duration: 2016 Sep 72016 Sep 11

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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