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Quantum spin ice on the breathing pyrochlore lattice

Author(s)
Savary, Lucile; Wang, Xiaoqun; Kee, Hae-Young; Kim, Yong Baek; Yu, Yue; Chen, Gang; ... Show more Show less
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Abstract
The Coulombic quantum spin liquid in quantum spin ice is an exotic quantum phase of matter that emerges on the pyrochlore lattice and is currently actively searched for. Motivated by recent experiments on the Yb-based breathing pyrochlore material Ba[subscript 3] Yb[subscript 2] Zn[subscript 5] O[subscript 11], we theoretically study the phase diagram and magnetic properties of the relevant spin model. The latter takes the form of a quantum spin ice Hamiltonian on a breathing pyrochlore lattice, and we analyze the stability of the quantum spin liquid phase in the absence of the inversion symmetry which the lattice breaks explicitly at lattice sites. Using a gauge mean-field approach, we show that the quantum spin liquid occupies a finite region in parameter space. Moreover, there exists a direct quantum phase transition between the quantum spin liquid phase and featureless paramagnets, even though none of theses phases break any symmetry. At nonzero temperature, we show that breathing pyrochlores provide a much broader finite-temperature spin liquid regime than their regular counterparts. We discuss the implications of the results for current experiments and make predictions for future experiments on breathing pyrochlores.
Date issued
2016-08
URI
http://hdl.handle.net/1721.1/110245
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review B
Publisher
American Physical Society
Citation
Savary, Lucile et al. “Quantum Spin Ice on the Breathing Pyrochlore Lattice.” Physical Review B 94.7 (2016): n. pag. © 2016 American Physical Society
Version: Final published version
ISSN
2469-9950
2469-9969

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