The mixed-spins 1/2 and 3/2 Blume-Capel model with a random crystal field


Albayrak E.

CHINESE PHYSICS B, cilt.21, sa.6, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 21 Sayı: 6
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1088/1674-1056/21/6/067501
  • Dergi Adı: CHINESE PHYSICS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: randomness, crystal field, Bethe lattice, mixed spin, bimodal, ISING FERRIMAGNETIC SYSTEM, BETHE LATTICE, MAGNETIC-PROPERTIES, SPIN-3/2, SPIN-1/2, PHASE
  • Erciyes Üniversitesi Adresli: Evet

Özet

The random crystal field (RCF) effects are investigated on the phase diagrams of the mixed-spins 1/2 and 3/2 Blume-Capel (BC) model on the Bethe lattice. The bimodal random crystal field is assumed and the recursion relations are employed for the solution of the model. The system gives only the second-order phase transitions for all values of the crystal fields in the non-random bimodal distribution for given probability. The randomness does not change the order of the phase transitions for higher crystal field values, i.e., it is always second-order, but it may introduce first-order phase transitions at lower negative crystal field values for the probability in the range about 0.20 and 0.45, which is only the second-order for the non-random case in this range. Thus our work claims that randomness may be used to induce first-order phase transitions at lower negative crystal field values at lower probabilities.