The specific heat of helium four near the superfluid transition in a confined geometry
Abstract
The specific heat of He4 confined to films and pores in filters has a rounded finite maximum shifted to a lower temperature than the bulk transition temperature. The shift exponent (lambda) and the rounding exponent (theta) obtained are 1/delta = 0.562 plus or minus 0.014 and 1/theta = 0.598 plus or minus 0.008 respectively. These results disagree with scaling predictions and model calculations. In helium, the correlation length exponent is 0.671. Data were analyzed by introducing the concept of a surface specific heat, which yielded a surface specific heat exponent of 0.547 plus or minus 0.015. A critical exponent for the surface correlation length was deduced.
 Publication:

Ph.D. Thesis
 Pub Date:
 May 1978
 Bibcode:
 1978PhDT........23C
 Keywords:

 Helium Isotopes;
 Liquid Helium;
 Specific Heat;
 Superfluidity;
 Transition Temperature;
 Critical Temperature;
 SolidState Physics