LOW-TEMPERATURE HEAT CAPACITIES OF POTASSIUM, RUBIDIUM, AND CESIUM
The heat capacities of potassium, rubidium, and cesium were measured between 0.2 and 4.2 deg K. The thermal effective mass ratios are 1.25, 1.26, and 1.43, respectively. For potassium and rubidium these quantities are in reasonable agreement with theoretical estimates of the effects of band structure, electron-electron interactions, and electron-phonon interaction. The trends of the calculated and measured values suggest that the energy-band calculations overestimate the distortion of the Fermi surface in cesium. For potassium the elastic constants are known and can be compared with the observed T/sup 3/ term in the lattice heat capacity. The agreement is within the expected experimental errors. The T/sup 5/ term, however, does not agree with calculations based on a model that includes only first- and second-neighbor interactions. (auth)
- Research Organization:
- Univ. of California, Berkeley
- NSA Number:
- NSA-18-010563
- OSTI ID:
- 4112014
- Report Number(s):
- UCRL-8990(Rev.); 0031-899X
- 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- Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 133; ISSN PHRVA
- Country of Publication:
- United States
- Language:
- English
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