›› 2014, Vol. 23 ›› Issue (7): 70511-070511.doi: 10.1088/1674-1056/23/7/070511

• GENERAL • 上一篇    下一篇

Nonequilibrium behavior of the kinetic metamagnetic spin-5/2 Blume-Capel model

Ümüt Temizer   

  1. Department of Physics, Bozok University, Yozgat 66200, Turkey
  • 收稿日期:2013-07-19 修回日期:2013-11-29 出版日期:2014-07-15 发布日期:2014-07-15

Nonequilibrium behavior of the kinetic metamagnetic spin-5/2 Blume-Capel model

Ümüt Temizer   

  1. Department of Physics, Bozok University, Yozgat 66200, Turkey
  • Received:2013-07-19 Revised:2013-11-29 Online:2014-07-15 Published:2014-07-15
  • Contact: Ümüt Temizer E-mail:umut.temizer@bozok.edu.tr
  • About author:05.70.Fh; 75.10.Hk; 74.40.Gh; 75.30.Kz

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摘要： The dynamic magnetic behavior of the kinetic metamagnetic spin-5/2 Blume-Capel model is examined, within a mean-field approach, under a time-dependent oscillating magnetic field. To describe the kinetics of the system, Glauber-type stochastic dynamics has been utilized. The mean-field dynamic equations of the model are obtained from the Master equation. Firstly, these dynamic equations are solved to find the phases in the system. Then, the dynamic phase transition temperatures are obtained by investigating the thermal behavior of dynamic sublattice magnetizations. Moreover, from this investigation, the nature of the phase transitions (first- or second-order) is characterized. Finally, the dynamic phase diagrams are plotted in five different planes. It is found that the dynamic phase diagrams contain the paramagnetic (P), antiferromagnetic (AF5/2, AF3/2, AF1/2) phases and five different mixed phases. The phase diagrams also display many dynamic critical points, such as tricritical point, triple point, quadruple point, double critical end point and separating point.

关键词: metamagnetism, spin-5/2 Blume-Capel model, dynamic phase transitions, dynamic phase diagrams, Glauber-type stochastic dynamics

Abstract: The dynamic magnetic behavior of the kinetic metamagnetic spin-5/2 Blume-Capel model is examined, within a mean-field approach, under a time-dependent oscillating magnetic field. To describe the kinetics of the system, Glauber-type stochastic dynamics has been utilized. The mean-field dynamic equations of the model are obtained from the Master equation. Firstly, these dynamic equations are solved to find the phases in the system. Then, the dynamic phase transition temperatures are obtained by investigating the thermal behavior of dynamic sublattice magnetizations. Moreover, from this investigation, the nature of the phase transitions (first- or second-order) is characterized. Finally, the dynamic phase diagrams are plotted in five different planes. It is found that the dynamic phase diagrams contain the paramagnetic (P), antiferromagnetic (AF5/2, AF3/2, AF1/2) phases and five different mixed phases. The phase diagrams also display many dynamic critical points, such as tricritical point, triple point, quadruple point, double critical end point and separating point.

Key words: metamagnetism, spin-5/2 Blume-Capel model, dynamic phase transitions, dynamic phase diagrams, Glauber-type stochastic dynamics

中图分类号:  (Phase transitions: general studies)

  • 05.70.Fh
75.10.Hk (Classical spin models) 74.40.Gh (Nonequilibrium superconductivity) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))