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Proximity induced metal-insulator transition inYBa2Cu3O7/La2/3Ca1/3MnO3superlattices

Todd Holden, H.-U. Habermeier, G. Cristiani, A. Golnik, A. Boris, A. Pimenov, J. Humlíc̆ek, O. I. Lebedev, G. Van Tendeloo, B. Keimer, C. Bernhard
2004 Physical Review B  

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2003 pre-print arXiv:cond-mat/0303284v1 fatcat:jmjtsrdobvf6rp5ycylekohogi
The far-infrared dielectric response of superlattices (SL) composed of superconducting YBa_2Cu_3O_7 (YBCO) and ferromagnetic La_0.67 Ca_0.33MnO_3 (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≈ 20 nm in YBCO and d^crit≈ 10 nm in LCMO. A corresponding suppression of metallicity is not observed in SLs where LCMO is replaced by the paramagnetic metal LaNiO_3. Our data suggest that
more » ... her 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 are 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 RuSr_2GdCu_2O_8 is possibly related to this effect.
doi:10.1103/physrevb.69.064505 fatcat:p5gdtemfc5g5nijcwugc64doue
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Todd Holden, H.-U. Habermeier, G. Cristiani, A. Golnik, A. Boris, A. Pimenov, J. Humlíc̆ek, O. I. Lebedev, G. Van Tendeloo, B. Keimer, C. Bernhard. "Proximity induced metal-insulator transition inYBa2Cu3O7/La2/3Ca1/3MnO3superlattices." Physical Review B 69.6 (2004)