We propose a hybrid model governed by the Blume-Emery-Griffiths (BEG) Hamiltonian with a mean-field-like interaction, where the spins are randomly quenched such that some of them are "pure"Ising and the others admit the BEG set of states. It is found, by varying the concentration of the Ising spins, that the model displays different phase portraits in concentration-temperature parameter space, within the canonical and the microcanonical ensembles. Phenomenological indications that these portraits are rich and rather unusual are provided.
Bibliographical noteFunding Information:
N.S. acknowledges support from the Israel Science Foundation (ISF) (IL), under Grant No. 977/17. R.C. and S.H. acknowledge support of Bar-Ilan Data Science Institute (DSI) and Israel Council for Higher Education (VATAT). This work was done while S.H. was visiting the Mathematics Department of Rutgers University-New Brunswick. We thank Prof. Gideon Amir for fruitful discussions.
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