Surface induced disorder in body-centered cubic alloys

Details Surface induced disorder in body-centered cubic alloys Surface induced disorder in body-centered cubic alloys

2000-02-10

arxiv.org/abs/cond-mat/0002161v1

Physics

Condensed Matter

Statistical Mechanics

To appear in Physical Review B

Scientific paper

10.1103/PhysRevB.61.15077

We present Monte Carlo simulations of surface induced disordering in a model of a binary alloy on a bcc lattice which undergoes a first order bulk transition from the ordered DO3 phase to the disordered A2 phase. The data are analyzed in terms of an effective interface Hamiltonian for a system with several order parameters in the framework of the linear renormalization approach due to Brezin, Halperin and Leibler. We show that the model provides a good description of the system in the vicinity of the interface. In particular, we recover the logarithmic divergence of the thickness of the disordered layer as the bulk transition is approached, we calculate the critical behavior of the maxima of the layer susceptibilities, and demonstrate that it is in reasonable agreement with the simulation data. Directly at the (110) surface, the theory predicts that all order parameters vanish continuously at the surface with a nonuniversal, but common critical exponent. However, we find different exponents for the order parameter of the DO3 phase and the order parameter of the B2 phase. Using the effective interface model, we derive the finite size scaling function for the surface order parameter and show that the theory accounts well for the finite size behavior of the DO3 ordering but not for that of B2 ordering. The situation is even more complicated in the neighborhood of the (100) surface, due to the presence of an ordering field which couples to the B2 order.

Affiliated with

Also associated with

No associations

Rating

Surface induced disorder in body-centered cubic alloys does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Surface induced disorder in body-centered cubic alloys, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface induced disorder in body-centered cubic alloys will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-482139