Ising-like model for the two-step spin-crossover systems: Static properties with magnetic field effects using cluster variation method
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Tarih
2021
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Yayıncı
Institute of Molecular Physics, Polish Academy of Sciences Faculty of Physics, Adam Mickiewicz University, Pozna?
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
We investigate the static properties of a two?sublattice Ising?like Hamiltonian for spin-crossover (SCO) systems in the presence of an external magnetic field. Self?consistent equations are obtained using cluster variation method in the lowest approximation. From the solutions of these equations, we present high?spin state fraction vs. temperature and magnetic field variations for various values of the degeneracy ratio between high?spin and low?spin states (r). It is shown that two metastable and one unstable (or saddle) branches in the SCO region are displayed in the r > 1 case while the metastable states disappear and only one saddle point occurs when r = 1. However, only stable states are obtained at high temperatures outside the SCO region. The comparison of our results to other theoretical treatments is also given
Açıklama
Anahtar Kelimeler
Kaynak
The European Conference PHYSICS OF MAGNETISM 2021 (PM’21)
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Künye
Veliu, V., Erdem, R., Özüm, S., Yalçın, O. (2021). Ising-like model for the two-step spin-crossover systems: Static properties with magnetic field effects using cluster variation method. The European Conference PHYSICS OF MAGNETISM 2021 (PM’21), June 28 - July 2, 2021, Pozna?, Poland
