Thermodynamic properties of aluminum near its superconducting critical temperature
Hopkins, Don Carlos
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https://hdl.handle.net/2142/16650
Description
Title
Thermodynamic properties of aluminum near its superconducting critical temperature
Author(s)
Hopkins, Don Carlos
Issue Date
1962
Doctoral Committee Chair(s)
Mapother, D.E.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
aluminum
Language
en
Abstract
The specific heat, latent heat and critical field of a single crystalline sphere of 99.995% pure aluminum have been measured simultaneous1y between 1.06 and 1.19°K. These three quantities are thermodynamically related, but the evidence existing at the inception of this work indicated a discrepancy between the critical field and specific heat much larger than the experimental uncertainty. However, in this work the independently measured thermodynamic properties were found to be much more consistent than previously observed. The specific heat and critical field measurements were found to be consistent with each other within experimental error, but the latent heat was found to deviate by a small but experimentally significant amount from consistency with the other two measured quantities. The detailed shape of the specific heat curve near T has also been measured in a magnetic field less than 10^-3 gauss with temperature intervals as fine as 18 x 10^-6°K. Temperature changes as small as 5 x 10^-6°K were detectable with power dissipation of .002 ergs/sec and time constant of 2.5 sec. The transition occurs at 1.180 ± .001°K with a smooth change in specific heat of 2.21 mjou1e/mo1e deg which is complete in about 2 x 10^-3 °K. The width and shape of the transition have been compared with a calculation based on temperature fluctuations.
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