Proximity induced metal/insulator transition in $Y Ba_2 Cu_3 O_7 / La_{2/3} Ca_{1/3} Mn O_3$ superlattices

Todd Holden; H-U. Habermeier; G. Cristiani; A. Golnik; A. Boris; A. Pimenov; J. Humlíucek; O. Lebedev; G. Van Tendeloo; B. Keimer; C. Bernhard

doi:10.1103/physrevb.69.064505

arXiv · cond-mat/0303284

Proximity induced metal/insulator transition in $Y Ba_2 Cu_3 O_7 / La_{2/3} Ca_{1/3} Mn O_3$ superlattices

Todd Holden·H-U. Habermeier·G. Cristiani·A. Golnik·A. Boris·A. Pimenov·J. Humlíucek·O. Lebedev·G. Van Tendeloo·B. Keimer·C. Bernhard

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Abstract

The far-infrared dielectric response of superlattices (SL) composed of superconducting YBa$_{2}$Cu$_{3}$O$_{7}$ (YBCO) and ferromagnetic La$_{0.67}$% Ca$_{0.33}$MnO$_{3}$ (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}\approx $20 nm in YBCO and d$^{crit}\approx $10 nm in LCMO. A corresponding suppression of metallicity is not observed in SLs where LCMO is replaced by the paramagnetic metal LaNiO$_{3}$. Our data suggest that either a long range charge transfer from the YBCO to the LCMO layers or alternatively a strong coupling of the charge carriers to the different and competitive kind of magnetic correlations in the LCMO and YBCO layers are at the heart of the observed metal/insulator transition. The low free carrier response observed in the far-infrared dielectric response of the magnetic superconductor RuSr$_{2}$GdCu$_{2}$O$_{8}$ is possibly related to this effect.

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Todd Holden, H-U. Habermeier, G. Cristiani, A. Golnik, A. Boris, A. Pimenov, J. Humlíucek, O. Lebedev, G. Van Tendeloo, B. Keimer, C. Bernhard. 2003-03-15. Proximity induced metal/insulator transition in $Y Ba_2 Cu_3 O_7 / La_{2/3} Ca_{1/3} Mn O_3$ superlattices. https://doi.org/10.1103/physrevb.69.064505

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