Critical behavior and phase transitions of a spin-5/2 diatomic Ising model on the Bethe lattice
EUROPEAN PHYSICAL JOURNAL B, cilt.99, ss.1-12, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 99
- Basım Tarihi: 2026
- Doi Numarası: 10.1140/epjb/s10051-026-01208-0
- Dergi Adı: EUROPEAN PHYSICAL JOURNAL B
- Derginin Tarandığı İndeksler: Academic Search Ultimate (EBSCO), Engineering Source (EBSCO), Scopus, Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest), Aerospace Database, Science Citation Index Expanded (SCI-EXPANDED), Chemical Abstracts Core, Compendex, INSPEC, MEDLINE, zbMATH
- Sayfa Sayıları: ss.1-12
- Erciyes Üniversitesi Adresli: Evet
Özet
We study a spin-5/2 diatomic Ising model on the Bethe lattice using exact recursion relations, focusing on the competition between ferromagnetic exchange energy and single-ion crystal-field anisotropy. At zero temperature, this competition leads to a first-order transition between low-spin and high-spin ground states. At finite temperature, entropy and thermal fluctuations significantly modify this balance, giving rise to hybrid phases, multistep transitions, and both first- and second-order phase boundaries. A key result is the emergence of a critical end point where the first-order line terminates and continuous behavior takes over. These results reveal rich multiscale criticality in high-spin diatomic systems.