Spin-glass dynamics in the presence of a magnetic field: exploration of microscopic properties. Issue 3 (8th March 2021)

• Record Type: Journal Article
• 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
• Is Part Of: Journal of statistical mechanics. Issue 3(2021)
• Publication Date: 2021-03-08
• Subjects: ergodicity breaking -- memory effects -- spin glasses; Statistical mechanics -- Periodicals; Mechanics -- Statistical methods -- Periodicals; 530.1305
• DOI: 10.1088/1742-5468/abdfca
• Languages: English
• ISSNs: 1742-5468

Abstract

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.