Mixed spin-1/2 and -5/2 Blume-Capel model as a diatomic molecule
EUROPHYSICS LETTERS, vol.155, pp.1-7, 2026 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 155
- Publication Date: 2026
- Doi Number: 10.1209/0295-5075/ae8931
- Journal Name: EUROPHYSICS LETTERS
- Journal Indexes: Scopus, Technology Collection (ProQuest), Aerospace Database, Science Citation Index Expanded (SCI-EXPANDED), Chemical Abstracts Core, INSPEC, Linguistic Bibliography, zbMATH
- Page Numbers: pp.1-7
- Open Archive Collection: AVESIS Open Access Collection
- Erciyes University Affiliated: Yes
Abstract
The Bethe lattice is configured to create a diatomic molecule composed of one spin-1/2 (σ) atom and one spin-5/2 (S) atom. Each molecule is permitted to engage with its q nearestneighbor molecules through diverse ferromagnetic (FM) bilinear interaction parameters. The crystal field (D) is incorporated into the model and is effective solely at spin-5/2 locations. Following an examination of magnetization behaviors, namely for spin-1/2, spin-5/2, and a molecular system, the phase diagrams are delineated for q = 3 and q = 4. As a result, four distinct phase regions were identified with the ground-state values of (M1/2,M5/2,MNet): FM1 with (±1/2, ±5/2, ±3), FM2 with (±1/2, ±3/2, ±2), FM3 with (±1/2, ±1/2, ±1), and FM4 characterized by minimal M values. The model delineates first- and second-order phase transition temperatures as depicted on the specified (D, T)-plane phase diagrams. Tricritical and end points are also observed.