3 PEAKS ON THE SPECIFIC-HEAT IN A FK-SYSTEM - A COMPUTER-SIMULATION

Static properties of the Frenkel-Kontorova model are studied by the Mo nte Carlo simulation: from calculations of the temperature dependent s pecific heat, a distribution map of number of peaks is shown in the rh o-U-nor plane, with rho and U-nor being the concentration and normaliz ed substrate potential, respectively. There exist regions of single pe ak, two peaks, and three peaks. The three peaks of the specific heat a re discussed for rho=7/10. The physical mechanism of the peaks is inve stiged with the help of the static structure factors.