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Phase diagrams of the kinetic metamagnetic spin‐3/2 Blume–Capel model in an oscillating external field
Author(s) -
Keskin M.,
Canko O.,
Kırak M.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200743082
Subject(s) - tricritical point , phase diagram , condensed matter physics , antiferromagnetism , phase (matter) , physics , field (mathematics) , multicritical point , mathematics , quantum mechanics , pure mathematics
Dynamic phase diagrams are calculated, within a mean‐field approach, for the kinetic metamagnetic spin‐3/2 Blume–Capel model in the presence of a time‐dependent oscillating external magnetic field using Glauber‐type stochastic dynamics and six fundamental types of phase diagrams are found in the reduced temperature ( T ) and magnetic‐field amplitude parameter ( h ) plane. The phase diagrams exhibit one, two or three dynamic tricritical points, and besides the paramagnetic (P), the antiferromagnetic‐3/2 (AF 3/2 ), the antiferromagnetic‐1/2 (AF 1/2 ) phases, three coexistence phase regions, namely AF 3/2 + P, AF 1/2 + P, AF 3/2 + AF 1/2 , exist depending upon the interaction parameters. The dynamic phase boundaries between the P and AF 3/2 phases are always second‐order lines, but between the P and AF 1/2 phases are second‐ or/and first‐order lines. All other dynamic phase boundaries among the disordered, ordered phases and coexistence phase regions are first‐order lines. We have investigated the influence of the crystal field interaction ( D ) and we obtain five different phase diagram topologies in ( d , T ) plane, d = D /′ We have also studied the influence of the frequency on the phase boundaries as well as the dynamic tricritical point and found that the topologies of the phase diagrams slightly change. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)