Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session Z62: Cooperative Phenomena, Theory
11:30 AM–2:30 PM,
Friday, March 8, 2024
Room: 208CD
Sponsoring
Unit:
GMAG
Chair: Jennifer Reid, National High Magnetic Field Laboratory
Abstract: Z62.00008 : Emergent Interactions in Anisotropic Dipolar Magnets
12:54 PM–1:06 PM
Presenter:
Tomer Dollberg
(Ben-Gurion University of the Negev)
Author:
Tomer Dollberg
(Ben-Gurion University of the Negev)
One notable example is the rare-earth material LiHoF4, which has been scrutinized experimentally, numerically and theoretically over many decades with the aim of understanding various collective magnetic phenomena.
Results from previous studies, using various Monte Carlo techniques and mean-field analyses, show a persistent discrepancy with experimental results for the Bx-T phase diagram. Namely, in the low-Bx regime, the experimental phase boundary separating the ferromagnetic and paramagnetic phases has a much smaller dependence on magnetic field compared to theoretical predictions.
We propose a mechanism that highlights the importance of quantum fluctuations, induced by the off-diagonal terms of the dipolar interaction, in determining the critical temperature of anisotropic dipolar magnets. Indeed, in a recent work [1], we numerically showed that the inclusion of such dipolar terms results in a significantly improved agreement with experimental data at zero and low transverse fields.
In this talk, we shall review previous numerical results and present a new analytical model [2] where off-diagonal dipolar terms are shown to generate effective three-body interactions that disfavor ferromagnetic order. Thus, the same improved agreement with experiment is obtained analytically as was obtained numerically, now extendable to the full phase diagram.
We also address the existence of this mechanism in other anisotropic dipolar systems.
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