Effects of bimodal random crystal field on the phase transition of mixed spin-1/2 and spin-1 on nanotube
The magnetization and phase transition of mixed spin-1/2 and spin-1 Blume-Capel model on a cylindrical Ising nanotube with bimodal random crystal fields were investigated by using the effective field theory.Employing numerical calculation,the phase diagrams and the magnetization which depends on the temperature and the parameters of random crystal fields were obtained.The results show that:(1)Changing the probability and the ratio of the crystal fields,bimodal random crystal fields may de-scribe different doped atoms acting on spins.(2)The critical points do exist for certain values of the probability,the negative or positive crystal field and the ratio of the crystal fields.(3)The system shows several phase transition temperatures,first-order and second-order phase transitions.
Random crystal fieldBlume-Capel modelNanotubeEffective field theory
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