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

• Published in: Journal of statistical mechanics Vol. 2021; no. 3; p. 33301
• Main Authors: Paga, I, Zhai, Q, Baity-Jesi, M, Calore, E, Cruz, A, Fernandez, L A, Gil-Narvion, J M, Gonzalez-Adalid Pemartin, I, Gordillo-Guerrero, A, Iñiguez, D, Maiorano, A, Marinari, E, Martin-Mayor, V, Moreno-Gordo, J, Muñoz-Sudupe, A, Navarro, D, Orbach, R L, Parisi, G, Perez-Gaviro, S, Ricci-Tersenghi, F, Ruiz-Lorenzo, J J, Schifano, S F, Schlagel, D L, Seoane, B, Tarancon, A, Tripiccione, R, Yllanes, D
• Format: Journal Article
• Language: English
• Published: United States IOP Publishing 01.03.2021
• Subjects: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Ergodicity breaking, memory effects, spin glasses; MATERIALS SCIENCE
• ISSN: 1742-5468; 1742-5468
• DOI: 10.1088/1742-5468/abdfca

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 T g . The spin-glass correlation length, ξ ( 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 ξ ( 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.