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.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2017 Apr 20|
|Event||8th International Conference on Highly Frustrated Magnetism 2016, HFM 2016 - Taipei, Taiwan|
Duration: 2016 Sep 7 → 2016 Sep 11
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)