Tomasello, Bruno, Castelnovo, Claudio, Moessner, Roderich, Quintanilla, Jorge (2019) Correlated Quantum Tunneling of Monopoles in Spin Ice. Physical Review Letters, 123 . ISSN 0031-9007. E-ISSN 1079-7114. (doi:10.1103/PhysRevLett.123.067204) (KAR id:75469)
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Official URL: https://dx.doi.org/10.1103/PhysRevLett.123.067204 |
Abstract
The spin ice materials Ho\(_2\)Ti\(_2\)O\(_7\) and Dy\(_2\)Ti\(_2\)O\(_7\) are by now perhaps the best-studied classical frustrated magnets. A crucial step towards the understanding of their low temperature behaviour -- both regarding their unusual dynamical properties and the possibility of observing their quantum coherent time evolution -- is a quantitative understanding of the spin-flip processes which underpin the hopping of magnetic monopoles. We attack this problem in the framework of a quantum treatment of a single-ion subject to the crystal, exchange and dipolar fields from neighbouring ions. By studying the fundamental quantum mechanical mechanisms, we discover a bimodal distribution of hopping rates which depends on the local spin configuration, in broad agreement with rates extracted from experiment. Applying the same analysis to Pr\(_2\)Sn\(_2\)O\(_7\) and Pr\(_2\)Zr\(_2\)O\(_7\), we find an even more pronounced separation of timescales signalling the likelihood of coherent many-body dynamics.
Item Type: | Article |
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DOI/Identification number: | 10.1103/PhysRevLett.123.067204 |
Uncontrolled keywords: | Physics of Quantum Materials, classical transport, frustrated magnestism, classical spin models, magnetic monopoles |
Subjects: |
Q Science > QC Physics > QC173.45 Condensed Matter Q Science > QC Physics > QC176 Solid state physics |
Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
Depositing User: | Jorge Quintanilla Tizon |
Date Deposited: | 19 Jul 2019 13:58 UTC |
Last Modified: | 04 Jul 2023 14:06 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/75469 (The current URI for this page, for reference purposes) |
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