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Proximity induced metal-insulator transition in YBa2Cu3O7/La2/3Ca1/3MnO3 superlattices

MPS-Authors
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Holden,  T.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Habermeier,  H.-U.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), 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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Boris,  A.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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

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Citation

Holden, T., Habermeier, H.-U., Cristiani, G., Golnik, A., Boris, A., Pimenov, A., et al. (2004). Proximity induced metal-insulator transition in YBa2Cu3O7/La2/3Ca1/3MnO3 superlattices. Physical Review B, 69(6): 064505.


Cite as: https://hdl.handle.net/21.11116/0000-000E-F667-9
Abstract
The far-infrared dielectric response of superlattices (SL) composed of
superconducting YBa2Cu3O7 (YBCO) and ferromagnetic La0.67Ca0.33MnO3
(LCMO) has been investigated by ellipsometry. A drastic decrease of the
free-carrier response is observed which involves an unusually large
length scale of d(crit)approximate to20 nm in YBCO and
d(crit)approximate to10 nm in LCMO. A corresponding suppression of
metallicity is not observed in SL's where LCMO is replaced by the
paramagnetic metal LaNiO3. Our data suggest that either a long-range
charge transfer from the YBCO to the LCMO layers or alternatively a
strong coupling of the charge carriers to the different and competitive
kind of magnetic correlations in the LCMO and YBCO layers is at the
heart of the observed metal-insulator transition. The low free-carrier
response observed in the far-infrared dielectric response of the
magnetic superconductor RuSr2GdCu2O8 is possibly related to this effect.