Ba3Yb2Zn5O11is exceptional among breathing pyrochlore compounds for being in the nearly-decoupled limit where inter-tetrahedron interactions are weak, hosting isolated clusters or molecular magnet-like tetrahedra of magnetic ytterbium (Yb3+) ions. In this work, we present the study carried out on single-crystal samples of the breathing pyrochlore Ba3Yb2Zn5O11, using a variety of magnetometry and neutron scattering techniques along with theoretical modeling. We employ inelastic neutron scattering to investigate the magnetic dynamics as a function of applied field (with respect to both magnitude and direction) down to a temperature of 70 mK, where inelastic scattering reveals dispersionless bands of excitations as found in earlier powder sample studies, in good agreement with a single-tetrahedron model. However, diffuse neutron scattering at zero field and dc-susceptibility at finite field exhibit features suggesting the presence of excitations at low-energy that are not captured by the single tetrahedron model. Analysis of the local structure down to 2 K via pair distribution function analysis finds no evidence of structural disorder. We conclude that effects beyond the single tetrahedron model are important in describing the low-energy, low-temperature physics of Ba3Yb2Zn5O11, but their nature remains undetermined.
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Das, Sitikantha D. ; Kundu, Sarbajaya ; Zhu, Zengwei ; Mun, Eundeok ; McDonald, Ross D. ; Li, Gang ; Balicas, Luis ; McCollam, Alix ; Cao, Gang ; Rau, Jeffrey G. ; et al ( , Physical Review B)
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Fu, Jianlong ; Rau, Jeffrey G. ; Gingras, Michel J. ; Perkins, Natalia B. ( , Physical Review B)
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Jaubert, L. D. ; Benton, Owen ; Rau, Jeffrey G. ; Oitmaa, J. ; Singh, R. R. ; Shannon, Nic ; Gingras, Michel J. ( , Physical Review Letters)
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Ko, Wing-Ho ; Jiang, Hong-Chen ; Rau, Jeffrey G. ; Balents, Leon ( , Physical Review B)