Ferrimagnetism in two-dimensional mixed-spin Ising model

Authors
Boechat, B Filgueiras, R Marins, L Cordeiro, C Branco, NS
Citation
B. Boechat et al., Ferrimagnetism in two-dimensional mixed-spin Ising model, MOD PHY L B, 14(20), 2000, pp. 749-758
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
MODERN PHYSICS LETTERS B
ISSN journal
02179849 → ACNP
Volume
14
Issue
20
Year of publication
2000
Pages
749 - 758
Database
ISI
SICI code
0217-9849(20000830)14:20<749:FITMIM>2.0.ZU;2-4
Abstract
We investigate the mixed-spin (spin-1/2 and spin-1) antiferromagnetic Ising model in two dimensions through a real-space renormalization group transfo rmation. The model includes nearest and next-nearest neighbor interactions and is suitable to describe ferrimagnetic ordering. We present the finite-t emperature phase diagram of the model. The presence of the second-neighbor bonds enlarge the ferrimagnetic phase. Our results do not indicate the exis tence of a tricritical point, contrary to previous effective-field calculat ions.