Title
Proximity induced metal-insulator transition in <tex>$YBa_{2}Cu_{3}O_{7}/La_{2/3}Ca_{1/3}MnO_{3}$</tex> superlattices Proximity induced metal-insulator transition in <tex>$YBa_{2}Cu_{3}O_{7}/La_{2/3}Ca_{1/3}MnO_{3}$</tex> superlattices
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Volume/pages
69(2004) :6 , p. 064505,1-064505,7
ISSN
1098-0121
1550-235X
ISI
000220092100066
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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.
E-info
https://repository.uantwerpen.be/docman/iruaauth/37bb38/a831789.pdf
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