The heat capacity of He-4 monolayers adsorbed on evaporated gold

被引:11
作者
Birmingham, JT
Richards, PL
机构
[1] UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA
[2] UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA
关键词
D O I
10.1007/BF02396735
中图分类号
O59 [应用物理学];
学科分类号
摘要
The specific heat of He-4 condensed on an evaporated gold surface has been measured for coverages between 0.007 and 0.096 Angstrom(-2) and temperatures between 0.4 and 3.0 K. There are at least two types of physisorption site on the gold surface with binding energies -83+/-7 and -94+/-7 K. For coverages below 0.06 Angstrom(-2) (similar to 0.5 monolayers), the He-4 is a two-dimensional classical gas at sufficiently high temperatures. At lower temperatures and higher coverages, the 4He forms condensed phases, including liquids, solids commensurate with the gold lattice, and incommensurate solids. The phase diagram of He-4/evaporated gold is similar to that for He-4/graphite, but the phase boundaries are shifted and not well defined, nor is the diagram as rich in structure.
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页码:267 / 286
页数:20
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