Monte Carlo study of transient states of order inYBa2Cu3Oz
Monte Carlo simulations of oxygen ordering in the YBa{sub 2}Cu{sub 3}O{sub {ital z}} system have been performed using a two-dimensional anisotropic Ising model. In agreement with experimental findings, transient phases are obtained at low temperatures. Observed structures are investigated, and the kinetics of their domain formation is described. The convergence of the system is seen to be exceptionally slow, and the rate of domain evolution is found to increase with decreasing oxygen content. The implications of these findings on the development of a complete theoretical ordering model for this system are discussed.
ABSTRACTLong-term travel behavior is difficult to observe and explain and even more difficult to forecast. This paper proposes an approach based on stochastic state equations to describe the gradua...