Publication Date

3-8-2021

Department

Ames Laboratory

Campus Units

Ames Laboratory

OSTI ID+

1770118

Report Number

IS-J 10434

DOI

10.1088/1742-5468/abdfca

Journal Title

Journal of Statistical Mechanics: Theory and Experiment

Volume Number

2021

Issue Number

3

First Page

033301

Abstract

The synergy between experiment, theory, and simulations enables a microscopic analysis of spin-glass dynamics in a magnetic field in the vicinity of and below the spin-glass transition temperature Tg. The spin-glass correlation length, ξ(t, tw; T), is analysed both in experiments and in simulations in terms of the waiting time tw after the spin glass has been cooled down to a stabilised measuring temperature T < Tg and of the time t after the magnetic field is changed. This correlation length is extracted experimentally for a CuMn 6 at. % single crystal, as well as for simulations on the Janus II special-purpose supercomputer, the latter with time and length scales comparable to experiment. The non-linear magnetic susceptibility is reported from experiment and simulations, using ξ(t, tw; T) as the scaling variable. Previous experiments are reanalysed, and disagreements about the nature of the Zeeman energy are resolved. The growth of the spin-glass magnetisation in zero-field magnetisation experiments, MZFC(t, tw; T), is measured from simulations, verifying the scaling relationships in the dynamical or non-equilibrium regime. Our preliminary search for the de Almeida–Thouless line in D = 3 is discussed.

DOE Contract Number(s)

AC02-07CH11358; SC0013599

Language

en

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Tuesday, March 08, 2022

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