SPECIFIC HEATS OF SUBMONOLAYER 4He FILMS ADSORBED ON GRAFOIL COATED WITH MONOLAYER ARGON

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Abstract
Measurements of the specific heat, C, of 4He adsorbed on grafoil coated with an argon monolayer were made in the temperature range 0.4 K to 4 K for fractional coverages x = 0.200, 0.277, 0.366, 0.437, 0.457, 0.502 and 0.544 (x = 1 corresponds to a completed monolayer). The resulting curves showed marked peaks, reaching values of C/Nk of from 2.5 to 3.2 at temperatures in the range 1.95 K to 2.54 K. Near 3.5 K, C/Nk falls to approximately temperature independent values between 0.85 and 1.0. A brief discussion is given for differences between the experimental results and theory

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