2018/10/31 by Bruno Tomasello, Claudio Castelnovo, Roderich Moessner +1 · 35 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Dipole #Ion #Magnetic and transport properties of perovskites and related materials #Magnetic monopole #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum mechanics #Quantum tunnelling #Spin (aerodynamics) #Spin ice #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.123.067204
published in Physical Review Letters 123(6), 067204 (American Physical Society) · 5 pages, 2 figures, 1 table; supplemental material attached
openalex publication_date 2019/08/09 · arxiv created 2019/08/13 · arxiv updated 2019/08/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 behavior-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 neighboring ions. By studying the fundamental quantum mechanical mechanisms, we discover a bimodal distribution of hopping rates that 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 signaling the likelihood of coherent many-body dynamics.