MPI für Festkörperforschung / FKF Publikationen 2004 |
|Proximity induced metal-insulator transition in YBa2Cu3O7/La2/3Ca1/3MnO3 superlattices|
|Authors:||Holden, T.; Habermeier, H.-U.; Cristiani, G.; Golnik, A.; Boris, A.; Pimenov, A.; Humlíček, J.; Lebedev, O. I.; Van Tendeloo, G.; Keimer, B.; Bernhard, C.|
|Date of Publication (YYYY-MM-DD):||2004|
|Title of Journal:||Physical Review B|
|Issue / Number:||6|
|Sequence Number of Article:||064505|
|Review Status:||not specified|
|Abstract / Description:||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.
|External Publication Status:||published|
|Communicated by:||Michaela Asen-Palmer|
|Affiliations:||MPI für Festkörperforschung|
|External Affiliations:||Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
; CUNY Brooklyn Coll, Dept Phys, Brooklyn, NY 11210 USA.
; Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland.
; Masaryk Univ, Dept Solid State Phys, CZ-61137 Brno, Czech Republic.
; Univ Antwerp, RUCA, EMAT, B-2020 Antwerp, Belgium.
|Identifiers:||ISI:000220092100066 [ID No:1] |
ISSN:1098-0121 [ID No:2]
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