Proximity induced metal/insulator transition in $YB{a}_{2}C{u}_3{O}_7/L{a}_{2/3}C{a}_{1/3}Mn{O}_3$ superlattices

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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