YAHNE, D. R.; PEREIRA, D.; JAUBERT, L.D.C.; SANJEEWA, L. D.; POWELL, M.; KOLIS, J. W.; XU, Guangyong; ENJALRAN, M.; GINGRAS, M. J. P.; ROSS, K. A.

doi:10.1103/PhysRevLett.127.277206

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YAHNE, D. R.
Colorado State University [Fort Collins] [CSU]

PEREIRA, D.
University of Waterloo [Waterloo]

JAUBERT, L.D.C.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Ce document a été publié dans

Physical Review Letters. 2021-12-30, vol. 127, p. 277206

American Physical Society

Résumé en anglais

Reentrance, the return of a system from an ordered phase to a previously encountered less-ordered one as a controlled parameter is continuously varied, is a recurring theme found in disparate physical systems, yet its microscopic cause is often not investigated thoroughly. Here, through detailed characterization and theoretical modeling, we uncover the microscopic mechanism behind reentrance in the strongly frustrated pyrochlore antiferromagnet Er2Sn2O7. We use single crystal heat capacity measurements to expose that Er2Sn2O7 exhibits multiple instances of reentrance in its magnetic field B vs temperature T phase diagram for magnetic fields along three cubic high symmetry directions. Through classical Monte Carlo simulations, mean field theory, and classical linear spin-wave expansions, we argue that the origins of the multiple occurrences of reentrance observed in Er2Sn2O7 are linked to soft modes. These soft modes arise from phase competition and enhance thermal fluctuations that entropically stabilize a specific ordered phase, resulting in an increased transition temperature for certain field values and thus the reentrant behavior. Our work represents a detailed examination into the mechanisms responsible for reentrance in a frustrated magnet and may serve as a template for the interpretation of reentrant phenomena in other physical systems.< Réduire

DOI

http://dx.doi.org/10.1103/PhysRevLett.127.277206

Project ANR

Design de la frustration: effets de surface et désordre

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798