Monte carlo simulation of polymer chain with ferromagnetic ising interaction

摘要

We consider a self-avoiding walking polymer chain with nearest-neighbor ferromagnetic Ising interaction (J > 0) on the simple cybic lattice. The magnetic and conformational properties are simulated using Monte Carlo technique was bond-fluctuation model. Spontaneous magnetization is observed at low temperature. We estimate the critical temperature T_c = 13.7 +- 0.05 (J/kappa_B) and the critical exponents approx= 0.42 and upsilon apprxo= 0.80 based on the finite-size scaling law. The values of alpha and upsilon are different from those of two-or three-dimensional Ising models, indicating that the phase transition in the Ising polymer chain model belongs to a different universality class. Near T_c, the chain also undergoes a collapse transition from random coil at T > T_c to compacted globule at T < T_c. We conclude that the phase transitions in the Ising polymer chain model result from the cooperative of configurational movement and the ferromagnetic Ising interaction.