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Thermoelectric Properties of YBa2Cu3O7-(La,Ca)MnO3 Superlattices

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arxiv 1209.3561 v1 pith:5ORGCF4L submitted 2012-09-17 cond-mat.str-el cond-mat.supr-con

Thermoelectric Properties of YBa2Cu3O7-(La,Ca)MnO3 Superlattices

S. Heinze , H.-U. Habermeier , G. Cristiani , S. Blanco Canosa , M. Le Tacon , B. Keimer This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords superlatticesindividuallayerlcmomno3seebeckthermoelectricybco
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We report measurements of the thermoelectric power and electrical resistivity of superlattices composed of the high-temperature superconductor YBa2Cu3O(7-delta) (YBCO) and the metallic ferromagnet La(2/3)Ca(1/3)MnO3 (LCMO) with individual layer thicknesses between 5 and 50 nm. Whereas YBCO and LCMO reference films prepared under the same conditions exhibit negative Seebeck coefficients, in excellent agreement with data on bulk compounds of identical composition, those of all superlattices are positive, regardless of the individual layer thickness. Having ruled out lattice strain and incomplete oxygenation, we attribute the observed sign reversal of the Seebeck coefficient to a long-range electronic reconstruction nucleated at the YBCO-LCMO interfaces.

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