Surface Science Letters Using Leed to Study Specific Heat Anomalies of Adsorbed Overlayers
نویسندگان
چکیده
Near a second order phase boundary the leading thermal dependence of the integrated intensities of “extra” LEED beams is proportional to q JTT,I’-” for T P T,, where (Y is the specific heat critical exponent. This behavior occurs when the correlation length exceeds the characteristic length of the instrument but is less than the characteristic size of defect-free regions. We illustrate these ideas using the structure factor of a ~(2x2) overlayer on a triangular lattice, simulated using Monte Carlo. Similar behavior can appear in other probes of phenomena dependent solely on finite-range correlations.
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