Dynamic phase transitions and dynamic phase diagrams of the spin-2 Blume-Capel model under an oscillating magnetic field within the effective-field theory |
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Authors: | Mehmet Erta? Bayram DevirenMustafa Keskin |
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Institution: | a Department of Physics, Erciyes University, 38039 Kayseri, Turkey b Institute of Science, Erciyes University, 38039 Kayseri, Turkey c Department of Physics, Nevsehir University, 50300 Nevsehir, Turkey |
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Abstract: | The dynamic phase transitions are studied in the kinetic spin-2 Blume-Capel model under a time-dependent oscillating magnetic field using the effective-field theory with correlations. The effective-field dynamic equation for the average magnetization is derived by employing the Glauber transition rates and the phases in the system are obtained by solving this dynamic equation. The nature (first- or second-order) of the dynamic phase transition is characterized by investigating the thermal behavior of the dynamic magnetization and the dynamic phase transition temperatures are obtained. The dynamic phase diagrams are constructed in the reduced temperature and magnetic field amplitude plane and are of seven fundamental types. Phase diagrams contain the paramagnetic (P), ferromagnetic-2 (F2) and three coexistence or mixed phase regions, namely the F2+P, F1+P and F2+F1+P, which strongly depend on the crystal-field interaction (D) parameter. The system also exhibits the dynamic tricritical behavior. |
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Keywords: | Spin-2 Blume-Capel model Effective-field theory Glauber-type stochastic dynamics Dynamic phase transition Oscillating magnetic field |
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