BEG spin-1 model with random exchange magnetic interactions for spin-crossover solids

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AuteurOGOU, BOLARINWA SALIOU
AuteurOKE, DJIDJOHO TOUSSAINT
AuteurKARIMOU, MOUNIROU
AuteurHONTINFINDE, FELIX
AuteurBOUKHEDDADEN, KAMEL
Date d'ajout2026-06-02T16:06:57Z
Date de disponibilite2026-06-02T16:06:57Z
Date de publication2023
ResumeWe have investigated magnetic phase diagrams of spin-crossover (SCO) solids throughout the Blume-Emery-Griffiths spin-1 model where the spin states ±1 and 0 are associated to high-spin state and low-spin states respectively. In the present work, the quadrupolar interaction, K, parameter depends linearly on temperature and accounts for the role of the lattice phonons in the elastic interactions between the SCO units. Magnetic interactions are randomly distributed in the system and are controlled by a factor γ = J ij /K such that for γ = 0 (J ij = 0), magnetic ordering is not expected. The crystal-field that acts on SCO sites depends both on the ligand-field strength and the degeneracy ratio between HS and LS states as in some previous works. The system is also under the effect of a random local magnetic field hi acting on each site i. The model is solved using a homogeneous mean field theory. Our investigations reveal the occurrence of thermally-induced gradual, and first-order spin-transitions by varying the model parameters. At vicinity of first-order transition, various types of isothermal magnetic hysteresis loops are obtained and their corresponding coercive field and loop patterns are discussed as function of temperature.
DOI10.1088/1361-648X/acee3e
Autre identifiantBECDB-13478
URIhttps://dspace.uac.bj/handle/123456789/11542
Languefr
Fait partie deJournal of Physics: Condensed Matter
Sujetspin-crossover solids
SujetBEG model spin-1
Sujetmean-field theory
Sujetrandom magnetic field (RMF)
Sujetrandom exchange interaction (REI)
Sujetphase diagrams
TitreBEG spin-1 model with random exchange magnetic interactions for spin-crossover solids
TypeArticle

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