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

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.

preprint2012arXivOpen access
S. HeinzeH. -U. HabermeierG. CristianiS. Blanco CanosaM. Le TaconB. Keimer
cond-mat.supr-concond-mat.str-el
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S. HeinzeH. -U. HabermeierG. CristianiS. Blanco CanosaM. Le TaconB. Keimer

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