Lattice thermal conductivity of copper alloys below 2 K

Thermal conductivity measurements have been made between 0.06 and 2 K on copper samples containing either 10 atomic percent aluminum, 30 atomic percent zinc, or 4 atomic percent nickel. These samples were studied in both annealed and heavily deformed conditions. No unusual behavior has been observed in the thermal conductivity of any of the alloys near 0.5 K as had previously been reported. In the CuAl alloy system a number of observations were made on the thermal transport properties of the phonons. The scattering of thermal phonons by conduction electrons below T z 1 K was found to be in good agreement with theory. A resonant interaction appears to exist between the phonons and dislocations at a resonant frequency of ~ 10^11 Hz. Several models of resonating dislocations are examined with respect to this data. The scattering of thermal phonons by dislocations in heavily deformed samples was also studied. No conclusions could be drawn about the mechanism or mechanisms involved in this scattering.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Vorhaus, James Louis

Contributors dc:contributor

• Anderson, A.C.

• lattice thermal conductivity
• copper alloys
• extremely low temperatures
• thermal phonon scattering

Statement dc:rights

• Copyright 1976 James Louis Vorhaus

Language dc:language

en

Identifier

3929513

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/25663