Quantum Spin Ice Dynamics in the Dipole-Octupole Pyrochlore Magnet Ce2Zr2O7
| Autor: | Kate Ross, Guangyong Xu, Matthew B. Stone, J. Dudemaine, Casey Marjerrison, Bruce D. Gaulin, Alexander I. Kolesnikov, Connor Buhariwalla, Evan M. Smith, Nicholas P. Butch, Andrea Bianchi, D. R. Yahne, J. Beare, Graeme Luke, J. D. Garrett, Jonathan Gaudet |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed matter physics Scattering Pyrochlore General Physics and Astronomy Order (ring theory) Neutron scattering engineering.material 01 natural sciences Magnetic susceptibility Inelastic neutron scattering Spin ice 0103 physical sciences engineering Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 010306 general physics |
| Zdroj: | Physical Review Letters. 122 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.122.187201 |
| Popis: | Neutron scattering measurements on the pyrochlore magnet Ce_{2}Zr_{2}O_{7} reveal an unusual crystal field splitting of its lowest J=5/2 multiplet, such that its ground-state doublet is composed of m_{J}=±3/2, giving these doublets a dipole-octupole (DO) character with local Ising anisotropy. Its magnetic susceptibility shows weak antiferromagnetic correlations with θ_{CW}=-0.4(2) K, leading to a naive expectation of an all-in, all-out ordered state at low temperatures. Instead, our low-energy inelastic neutron scattering measurements show a dynamic quantum spin ice state, with suppressed scattering near |Q|=0, and no long-range order at low temperatures. This is consistent with recent theory predicting symmetry-enriched U(1) quantum spin liquids for such DO doublets decorating the pyrochlore lattice. Finally, we show that disorder, especially oxidation of powder samples, is important in Ce_{2}Zr_{2}O_{7} and could play an important role in the low-temperature behavior of this material. |
| Databáze: | OpenAIRE |
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