HEAT CAPACITY OF ALUMINUM BETWEEN 0.1 K AND 4.0 K
Measurements of thc heat capacity of aluminum have been made betwecn O.11 and 4.0 deg K in the normal state and between 0.17 and 4.0 deg K in the superconducting state. Within the experimental error the normal state heat capacity, C/sub n/, can be represented by C/sub n/ = gamma T + BETA T/sup 3/ with gamma = 1.35 x 10/sup -3/ joules/mole deg/sup 2/ and a value of BETA corresponding to a Debye temperature of 427.7 deg in agreement wlth calculations based on elastic coastants. For reduced temperatures between 0.5 and 0.25 the electronic heat capacity in the superconducting state, C/sub es/, is approximated by C/sub es// gamma T/sub c/ = 7.1 exp (--1.34 T/sub c//T), in which T/sub c/ is the transition temperature, 1.163 deg K At reduced temperatures less than about 0.25, C/sub es/ is greater than an extrapolation of the exponential, the difference amounting to a factor of 4 at the lowest temperature. The departure of C/sub es/ from an exponential temperature dependence, which is believed to be outside the experimental error, is not consistent with the existence of a constant energy gap at low reduced temperatures. The calculated critical field is 103.0 gauss at O deg K and shows a maximum negative deviation of 4% from the parabolic law. The results are compared with other measurements and with theory. (auth)
- Research Organization:
- Univ. of California, Berkeley
- NSA Number:
- NSA-13-017114
- OSTI ID:
- 4226707
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 114; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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