Bimodal-random field Blume-Capel model in the cluster variation method

Yessoufou R. A. A., Albayrak E., Seto G.

CHINESE JOURNAL OF PHYSICS, cilt.77, ss.2713-2723, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 77
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.cjph.2022.01.007
  • Dergi Adı: CHINESE JOURNAL OF PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.2713-2723
  • Anahtar Kelimeler: Blume-Capel model, Spin-1, Random magnetic field, Tricritical behavior, Hysteresis loops, CRYSTAL-FIELD, ISING-MODEL, PHASE-TRANSITIONS, BETHE LATTICE, SPIN-1, ANISOTROPY
  • Erciyes Üniversitesi Adresli: Evet

Özet

The outcome of the bimodal random magnetic field acting up or down along the z-axis on the spins of spin-1 with equal probability is investigated by using the lowest approximation of the cluster-variation method in the Blume-Capel model. The equal probability, p = 21, causes the model to give phase transitions of the form either second-or first-order. The phase diagrams of the model are computed on the (D, kBT/J) and (h, kBT/J) planes by taking into account the thermal variations of the order-parameters. The obtained phase diagrams reveal different phase regions with ground state values of 1 and 1/2 in addition to tricritical and critical end points. Simple and double hysteresis loops are also observed in the model.