PIRSA:17050092

Ba3Yb2Zn5O11: A model system for anisotropic exchange on the breathing pyrochlore lattice

Rau, J. (2017). Ba3Yb2Zn5O11: A model system for anisotropic exchange on the breathing pyrochlore lattice. Perimeter Institute. https://pirsa.org/17050092

Rau, Jeffrey. Ba3Yb2Zn5O11: A model system for anisotropic exchange on the breathing pyrochlore lattice. Perimeter Institute, May. 25, 2017, https://pirsa.org/17050092 

          @misc{ pirsa_PIRSA:17050092,
            doi = {10.48660/17050092},
            url = {https://pirsa.org/17050092},
            author = {Rau, Jeffrey},
            keywords = {Condensed Matter},
            language = {en},
            title = {Ba3Yb2Zn5O11: A model system for anisotropic exchange on the breathing pyrochlore lattice},
            publisher = {Perimeter Institute},
            year = {2017},
            month = {may},
            note = {PIRSA:17050092 see, \url{https://pirsa.org}}
          }

Jeffrey Rau University of Toronto

Talk number PIRSA:17050092
DOI 10.48660/17050092
Collection
Talk Type Conference
Subject

Abstract

In this talk we present a study of the “breathing” pyrochlore compound Ba3Yb2Zn5O11. Due to the nearly decoupled nature of its tetrahedral units, this compound serves as an ideal testbed for exploring the nature of anisotropic exchange in a theoretically and experimentally tractable rare-earth system. The relevant low-energy model of the Yb3+ tetrahedra is parametrized by four anisotropic exchange constants and is capable of reproducing the inelastic neutron scattering data, specific heat, and magnetic susceptibility with high fidelity. Using this model, we predict the appearance of an unusual non-Kramers octupolar paramagnet at low temperatures. We further speculate on possible collective, inter-tetrahedron physics of these non-Kramers doublets and discuss applications to about anisotropic exchange in other rare-earth magnets.