Roughening and Preroughening of Diamond-Cubic{111}Surfaces

Donald L. Woodraska, John A. Jaszczak
1997 Physical Review Letters  
A solid-on-solid model for ͕111͖ surfaces of diamond-cubic materials that correctly takes into account the diamond-cubic crystal structure has been developed for Monte Carlo simulation. In addition to a roughening transition at temperature T R , a distinct preroughening transition at T PR ഠ 0.43T R is indicated by divergences in the surface specific heat and order-parameter susceptibility. Preroughening appears to arise naturally in our nearest-neighbor bond model from the entropic freedom
more » ... able in the nontrivial crystal structure. Preroughening is shown to dramatically lower the nucleation barrier for growth and etching at low driving forces. [S0031-9007(96)02096-0]
doi:10.1103/physrevlett.78.258 fatcat:bsvissx575hmdkxinsko57nk5y