Renormalization-group magnetization of a ferrimagnetic Ising system

Autor: B. Boechat, R.A. Filgueiras, C. E. Cordeiro, N. S. Branco
Rok vydání: 2002
Předmět:
Zdroj: Physica A: Statistical Mechanics and its Applications. 304:429-442
ISSN: 0378-4371
DOI: 10.1016/s0378-4371(01)00560-x
Popis: We employ a real-space renormalization-group (RSRG) approach to study a mixed-spin (spin- 1 2 and spin-1) antiferromagnetic Ising model on the square lattice. The model incorporates next-nearest-neighbor interactions which are relevant to describe ferrimagnetism. We present an RSRG calculation of the spontaneous magnetization and compensation temperatures of the mixed-spin model. The influence of crystal-field and next-nearest-neighbor interactions on compensation temperatures is studied; the important physical ingredient that leads to the presence of these temperatures is the next-nearest-neighbor coupling between spins 1 2 .
Databáze: OpenAIRE