TY - JOUR
T1 - Band structure and heat capacity of low-coverage helium films on noble-gas-plated graphite
AU - Schwartz, Carey
AU - Cole, Milton W.
PY - 1986
Y1 - 1986
N2 - Calculations are presented of the energy band structure of He4 atoms moving across the surface of a monolayer of Ar, Kr, or Xe adsorbed on graphite. The results are very sensitive to adsorbate density, allowing the possibility of experimentally varying the degree of He localization. From the dispersion relation, the density of states and low-coverage heat capacity are computed. In the case of Ar plating, agreement is obtained with the isosteric heat measurement of Lerner and Daunt. Speculation is made that the heat-capacity data of Crary et al. are influenced by Ar atoms on the second layer. In the case of Kr plating, satisfactory agreement is obtained with the data of Tejwani, Ferreira, and Vilches.
AB - Calculations are presented of the energy band structure of He4 atoms moving across the surface of a monolayer of Ar, Kr, or Xe adsorbed on graphite. The results are very sensitive to adsorbate density, allowing the possibility of experimentally varying the degree of He localization. From the dispersion relation, the density of states and low-coverage heat capacity are computed. In the case of Ar plating, agreement is obtained with the isosteric heat measurement of Lerner and Daunt. Speculation is made that the heat-capacity data of Crary et al. are influenced by Ar atoms on the second layer. In the case of Kr plating, satisfactory agreement is obtained with the data of Tejwani, Ferreira, and Vilches.
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U2 - 10.1103/PhysRevB.34.1250
DO - 10.1103/PhysRevB.34.1250
M3 - Article
AN - SCOPUS:0242356231
VL - 34
SP - 1250
EP - 1256
JO - Physical Review B
JF - Physical Review B
SN - 0163-1829
IS - 2
ER -