Kapitza resistance between liquid and solid helium
The results of a study of the Kapitza resistance (R/sub K/ between liquid and solid helium-4 are presented. In the first chapter the recent proposal by Andreev and Parshin that, because of quantum delocalization of surface defects, the boundary between liquid and solid helium-4 would be in a special state is discussed. This state may be regarded as a quantum analog of an atomically rough interface. This particular interface is able to impede the passage of phonons because it can melt or freeze without dissipation as a response to an external non-equilibrium situation, i.e., pressure waves (phonons). In the second chapter two calculations of R/sub K/ are presented. One of them, the Acoustic-Mismatch calculation, is based on a model of the interface where no melting or freezing can occur. In this model the interface behaves as classical (non-rough). The usual T/sup -3/ temperature dependence is obtained. The other calculation is based on the model of the rough interface of Andreev and Parshin. R/sub K/ has a T/sup -5/ temperature dependence at low temperatures. At high temperatures (T > 0.5K) the two theories give approximately the same result for R/sub K/. In the third and fourth chapter experimental results for the phonon transmission coefficient across the interface are presented. These measurements are consistent with the rough interface theory of the Kapitza resistance.
- Research Organization:
- Brown Univ., Providence, RI (USA)
- OSTI ID:
- 7025515
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Kapitza resistance and related phenomena
Steady-state and second-sound measurements of Kapitza resistance
Related Subjects
HELIUM 4
KAPITZA RESISTANCE
BOUNDARY LAYERS
LIQUIDS
PHONONS
ROUGHNESS
SOLIDS
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THEORETICAL DATA
DATA
EVEN-EVEN NUCLEI
FLUIDS
HELIUM ISOTOPES
INFORMATION
ISOTOPES
LAYERS
LIGHT NUCLEI
NUCLEI
NUMERICAL DATA
QUASI PARTICLES
STABLE ISOTOPES
THERMAL BOUNDARY RESISTANCE
360603* - Materials- Properties