Measurement of the Seebeck coefficient by an ac technique: Application to high-temperature superconductors
Authors:
- 1 October 1993
- journal article
- conference paper
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 64 (10) , 2938-2941
Abstract
We report on a sensitive and reliable ac technique to measure the Seebeck coefficient S of materials, in particular of high Tc superconductors. The small temperature difference between the ends of the sample allows structure in the S(T) curve to be observed. This technique avoids the creation of a component proportional to dS/dT in the measured signal. Such a component has in the past led to erroneous conclusions regarding the high‐temperature superconductor YBCO. A mathematical analysis shows the origin of this component and how it can be avoided. These predictions are confirmed by experiments on a YBCO single crystal.Keywords
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