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Observation of the Analog of the Fountain Effect in a Superconducting YBaCuO Film

Ustinov, A. V.; Hartmann, M.; Huebener, R. P.


We have observed experimentally the analog of the superfluid-helium fountain effect in a polycrystalline YBaCuO film. In the presence of a temperature gradient parallel to an electric current we have detected an asymmetry of the current-voltage characteristic. Reversing the direction of the temperature gradient also reverses the sign of the current asymmetry. The effect is most produced in zero magnetic field and is vanishing in a field of only a few Gauss. Our explanation is based on a two-fluid model by which the temperature gradient induces a counterflow of superconducting Electrons and quasi-particles. The resulting supercurrent generates a phase difference at the intra- and intergrain weak links and superimposes to the external current, thereby changing the critical value of the latter. From this thermally induced critical-current asymmetry we estimate the thermopower for the quasi-particles in the superconducting state of our sample.

DOI: 10.1209/0295-5075/13/2/013
Zitationen: 12
Web of Science
Zitationen: 11
Zitationen: 12
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 15.09.1990
Sprache Englisch
Identifikator ISSN: 0295-5075, 1286-4854
KITopen-ID: 1000078036
Erschienen in epl
Verlag EDP Sciences
Band 13
Heft 2
Seiten 175–180
Nachgewiesen in Scopus
Web of Science
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