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research article

Frustrated magnets in the limit of infinite dimensions: Dynamics and disorder-free glass transition

Mauri, Achille  
•
Katsnelson, Mikhail I.
April 18, 2024
Physical Review B

We study the statistical mechanics and the equilibrium dynamics of a system of classical Heisenberg spins with frustrated interactions on a d -dimensional simple hypercubic lattice, in the limit of infinite dimensionality d -> infinity . In the analysis we consider a class of models in which the matrix of exchange constants is a linear combination of powers of the adjacency matrix. This choice leads to a special property: the Fourier transform of the exchange coupling J ( k ) presents a ( d - 1) -dimensional surface of degenerate maxima in momentum space. Using the cavity method, we find that the statistical mechanics of the system presents for d -> infinity a paramagnetic solution which remains locally stable at all temperatures down to T = 0. To investigate whether the system undergoes a glass transition we study its dynamical properties assuming a purely dissipative Langevin equation, and mapping the system to an effective single -spin problem subject to a colored Gaussian noise. The conditions under which a glass transition occurs are discussed including the possibility of a local anisotropy and a simple type of anisotropic exchange. The general results are applied explicitly to a simple model, equivalent to the isotropic Heisenberg antiferromagnet on the d -dimensional face -centered -cubic lattice with first- and secondnearest -neighbor interactions tuned to the point J 1 = 2 J 2 . In this model, we find a dynamical glass transition at a temperature T g separating a high -temperature liquid phase and a low -temperature vitrified phase. At the dynamical transition, the Edwards -Anderson order parameter presents a jump demonstrating a first -order phase transition.

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Type
research article
DOI
10.1103/PhysRevB.109.144414
Web of Science ID

WOS:001246123500002

Author(s)
Mauri, Achille  
•
Katsnelson, Mikhail I.
Date Issued

2024-04-18

Publisher

Amer Physical Soc

Published in
Physical Review B
Volume

109

Issue

14

Article Number

144414

Subjects

Technology

•

Physical Sciences

•

Electronic-Structure Calculations

•

Mean-Field-Theory

•

Spin-Glasses

•

Liquids

•

Entropy

•

Model

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
IIE  
FunderGrant Number

European Research Council (ERC) under the European Union

854843

Dutch Research Council (NWO) via the Spinoza Prize

Available on Infoscience
July 3, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/209044
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