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Bag, Rabindranath ; Ennis, Matthew ; Liu, Chunxiao ; Dissanayake, Sachith E. ; Shi, Zhenzhong ; Liu, Jue ; Balents, Leon ; Haravifard, Sara ( , Physical Review B)
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Dissanayake, Sachith ; Shi, Zhenzhong ; Rau, Jeffrey G. ; Bag, Rabindranath ; Steinhardt, William ; Butch, Nicholas P. ; Frontzek, Matthias ; Podlesnyak, Andrey ; Graf, David ; Marjerrison, Casey ; et al ( , npj Quantum Materials)
Abstract 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.