Reflection high-energy electron-diffraction study of melting and solidification of Pb on graphite

[摘要] The melting and solidification of Pb thin films on pyrolytic graphite are investigated in situ by reflection high-energy electron diffraction. Thin films with thicknesses of 4-150 monolayers are investigated. The surface morphology of the thin films were studied by scanning electron microscopy. Superheating of the Pb thin films by 4+/-2 to 12+/-2 K is observed from diffraction intensity measurements. Upon cooling the substrate, the Pb on graphite is seen to supercool by similar to 69+/-4 K.

[关键词] SCANNING-TUNNELING-MICROSCOPY;EQUILIBRIUM SHAPE;SURFACE;LEAD;CRYSTALS;TEMPERATURE;PB(111);FILMS