Behavior of the breathing pyrochlore lattice Ba${}_3$Yb${}_2$Zn${}_5$O${}_{11}$ in applied magnetic field

Abstract

The breathing pyrochlore lattice material Ba${}_3$Yb${}_2$Zn${}_5$O${}_{11}$ exists in the nearly decoupled limit, in contrast to most other well-studied breathing pyrochlore compounds. As a result, it constitutes a useful platform to benchmark theoretical calculations of exchange interactions in insulating Yb${}^{3+}$ magnets. Here we study Ba${}_3$Yb${}_2$Zn${}_5$O${}_{11}$ at low temperatures in applied magnetic fields as a further probe of the physics of this model system. Experimentally, we consider the behavior of polycrystalline samples of Ba${}_3$Yb${}_2$Zn${}_5$O${}_{11}$ with a combination of inelastic neutron scattering and heat capacity measurements down to 75 mK and up to fields of 10 T. Consistent with previous work, inelastic neutron scattering finds a level crossing near 3 T, but no significant dispersion of the spin excitations is detected up to the highest applied fields. Refinement of the theoretical model previously determined at zero field can reproduce much of the inelastic neutron scattering spectra and specific heat data. A notable exception is a low temperature peak in the specific heat near 0.1 K. This may indicate the scale of interactions between tetrahedra or may reflect undetected disorder in Ba${}_3$Yb${}_2$Zn${}_5$O${}_{11}$.

arXiv comment7 pages 4 figures

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• Cluster Frustration in the Breathing Pyrochlore Magnet LiGaCr4S8
• Symmetry fractionalization in the gauge mean-field theory of quantum spin ice
• Competing quantum spin liquids, gauge fluctuations, and anisotropic interactions in a breathing pyrochlore lattice
• Effects of spin-lattice coupling and a magnetic field in classical Heisenberg antiferromagnets on the breathing pyrochlore lattice
• Hedgehog lattice and field-induced chirality in breathing-pyrochlore Heisenberg antiferromagnets
• Ferromagnetic Cr4PtGa17: A Novel Half-Heusler-Type Compound with a Breathing Pyrochlore Lattice
• Beyond Single Tetrahedron Physics of Breathing Pyrochlore Compound Ba3Yb2Zn5O11
• Néel Ordering in the Distorted Honeycomb Pyrosilicate: C-Er${}_2$Si${}_2$O${}_7$
• Theta electromagnetism in quantum spin ice: Microscopic analysis of improper symmetries
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