Critical behavior in a random field classical XY model for amorphous systems

• Published in: Physica. B, Condensed matter Vol. 384; no. 1; pp. 212 - 214
• Main Authors: de Albuquerque, D.F., Alves, S.R.L., de Arruda, A.S., Moreno, N.O.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2006; Elsevier
• Subjects: Amorphous systems; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical behavior; Critical-point effects, specific heats, short-range order; Exact sciences and technology; General theory and models of magnetic ordering; Magnetic properties and materials; Physics; Random field; Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.); XY model; Random field; XY model; Amorphous systems; Critical behavior; Effective field approximation; Phase diagrams; Amorphization; Ferromagnetic materials; Amorphous state; Critical phenomena; Spin cluster; Tricritical point; Classical theory
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2006.05.264

By using the differential operator technique and the effective field theory (EFT) scheme, the critical behavior of amorphous classical XY ferromagnet in a random field is studied. The phase diagram in the T – H and T – α planes on a simple cubic lattice for a cluster with two spins is obtained. Calculation is carried out within the EFT approximation. Tricritical points, reentrant phenomena and influence of the random field and amorphization on the transition temperature are discussed.