Spin-glass dynamics in the presence of a magnetic field: exploration of microscopic properties

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 T-g. The spin-glass correlation length, xi(t, t(w); T), is analysed both in experiments and in simulati...

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Authors: Paga, I., Zhai, Q., Baity-Jesi, M., Calore, E., Cruz, A., Fernández Pérez, Luis Antonio, Gil-Narvión, J. M., González-Adalid Pemartín, Isidoro, Gordillo Guerrero, A., Iñiguez, D., Maiorano, A., Marinari, E., Martín Mayor, Víctor, Moreno Gordo, J., Muñoz Sudupe, Antonio, Navarro, D., Orbach, R. L., Parisi, G., Perez-Gaviro, S., Ricci-Tersenghi, F., Ruiz-Lorenzo, J. J., Schifano, S. F., Schlagel, D. L., Seoane Bartolomé, Beatriz, Tarancón, A., Tripiccione, R., Yllanes, D.
Format: article
Publication Date:2021
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/8010
Online Access:https://hdl.handle.net/20.500.14352/8010
Access Level:Open access
Keyword:53
Ergodicity breaking
Memory effects
Spin glasses
Física (Física)
22 Física
Description
Summary: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 T-g. The spin-glass correlation length, xi(t, t(w); T), is analysed both in experiments and in simulations in terms of the waiting time t(w) after the spin glass has been cooled down to a stabilised measuring temperature T < T-g 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 xi(t, t(w); 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, M-ZFC(t, t(w); 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.

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