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Thermoelectric properties of YBa2Cu3O7-δ-La2/3Ca1/3MnO3 superlattices

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Habermeier,  H.-U.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Cristiani,  G.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Le Tacon,  M.
Solid State Spectroscopy, Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer,  B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Heinze, S., Habermeier, H.-U., Cristiani, G., Canosa, S. B., Le Tacon, M., & Keimer, B. (2012). Thermoelectric properties of YBa2Cu3O7-δ-La2/3Ca1/3MnO3 superlattices. Applied Physics Letters, 101(13): 131603.


Cite as: https://hdl.handle.net/21.11116/0000-000E-C203-3
Abstract
We report measurements of the thermoelectric power and electrical resistivity of superlattices composed of the high-temperature superconductor YBa2Cu3O7-delta (YBCO) and the metallic ferromagnet La2/3Ca1/3MnO3 (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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4754707]