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Title: Method for measurement of specific heat by increasing and decreasing temperatue (in French)

Abstract

It is difficult to obtain equilibrium values of entropy from measured thermal quantities, for superconductors in a mixed phase, because of irreversible behavior generally observed in real samples. It is possible to reduce, even suppress, the uncertainty arising from interpretation of results, if entropy variations are determined not only for increasing magnetic field and temperature, but also for decreasing field and temperature. A method to measure the specific heat is described, which is valid for T < ~10 deg K. As in the case of the heat burst method, the advantage is that the determination occurs from quasi- equilibrium states in temperature of the system. In addition, a heat leak allows us also to make measurements with decreasing temperature, as in the cooling curve method. The theoretical model corresponding to the experimental arrangement is thoroughly analysed from a mathematical point of view. Systematic errors, arising from the method itself, may be reduced to less than 0.5% and temperature variations of a few millidegrees can still be measured with a precision of the order of 1%. This procedure is then well adapted to the detailed study of superconducting phase transitions. (auth)

Authors:
;
Publication Date:
Research Org.:
Univ., Lausanne, Switzerland
OSTI Identifier:
4416182
NSA Number:
NSA-29-001567
Resource Type:
Journal Article
Resource Relation:
Journal Name: Z. Angew. Math. Phys., v. 24, no. 2, pp. 225-247; Other Information: Orig. Receipt Date: 30-JUN-74
Country of Publication:
Country unknown/Code not available
Language:
French
Subject:
N66200* -Physics (Low Temperature)-Superconductivity; *SPECIFIC HEAT- MEASURING METHODS; *SUPERCONDUCTORS- SPECIFIC HEAT; ENTROPY; IRREVERSIBLE PROCESSES; MAGNETIC FIELDS; VARIATIONS

Citation Formats

Ehrat, R., and Rinderer, L. Method for measurement of specific heat by increasing and decreasing temperatue. Country unknown/Code not available: N. p., 1973. Web.
Ehrat, R., & Rinderer, L. Method for measurement of specific heat by increasing and decreasing temperatue. Country unknown/Code not available.
Ehrat, R., and Rinderer, L. Mon . "Method for measurement of specific heat by increasing and decreasing temperatue". Country unknown/Code not available.
@article{osti_4416182,
title = {Method for measurement of specific heat by increasing and decreasing temperatue},
author = {Ehrat, R. and Rinderer, L.},
abstractNote = {It is difficult to obtain equilibrium values of entropy from measured thermal quantities, for superconductors in a mixed phase, because of irreversible behavior generally observed in real samples. It is possible to reduce, even suppress, the uncertainty arising from interpretation of results, if entropy variations are determined not only for increasing magnetic field and temperature, but also for decreasing field and temperature. A method to measure the specific heat is described, which is valid for T < ~10 deg K. As in the case of the heat burst method, the advantage is that the determination occurs from quasi- equilibrium states in temperature of the system. In addition, a heat leak allows us also to make measurements with decreasing temperature, as in the cooling curve method. The theoretical model corresponding to the experimental arrangement is thoroughly analysed from a mathematical point of view. Systematic errors, arising from the method itself, may be reduced to less than 0.5% and temperature variations of a few millidegrees can still be measured with a precision of the order of 1%. This procedure is then well adapted to the detailed study of superconducting phase transitions. (auth)},
doi = {},
journal = {Z. Angew. Math. Phys., v. 24, no. 2, pp. 225-247},
number = ,
volume = ,
place = {Country unknown/Code not available},
year = {Mon Jan 01 00:00:00 EST 1973},
month = {Mon Jan 01 00:00:00 EST 1973}
}