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Correlated Quantum Tunneling of Monopoles in Spin Ice

Tomasello, Bruno, Castelnovo, Claudio, Moessner, Roderich, Quintanilla, Jorge (2019) Correlated Quantum Tunneling of Monopoles in Spin Ice. Physical Review Letters, 123 . 067204-1. ISSN 0031-9007. (doi:10.1103/PhysRevLett.123.067204)

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The spin ice materials Ho2Ti2O7 and Dy2Ti2O7 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 Pr2Sn2O7 and Pr2Zr2O7, we find an even more pronounced separation of timescales signalling the likelihood of coherent many-body dynamics.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevLett.123.067204
Uncontrolled keywords: Physics of Quantum Materials
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QC Physics > QC176 Solid state physics
Q Science
Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Jorge Quintanilla
Date Deposited: 19 Jul 2019 13:58 UTC
Last Modified: 16 Oct 2019 09:53 UTC
Resource URI: (The current URI for this page, for reference purposes)
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