2021/01/31 by I Paga, I. Paga, Q. Zhai +50 · 15 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Dynamics (music) #Field (mathematics) #Line (geometry) #Magnetic field #Magnetization #Rare-earth and actinide compounds #Scaling #Spin glass #Theoretical and Computational Physics #Zeeman effect #cond-mat.dis-nn
paper · pdf · doi:10.1088/1742-5468/abdfca
published in Journal of Statistical Mechanics Theory and Experiment 2021(3), 033301 (Institute of Physics) · 49 pages, figures 25
openalex created_date 2021/01/18 · openalex publication_date 2021/03/01 · arxiv created 2021/03/10 · arxiv updated 2021/03/23 · openalex updated_date 2026/08/05
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.