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We report a spectral ellipsometry study of multilayers composed ofsuperconducting YBa$_2$Cu$_3$O$_{6+\delta}$ (YBCO) and ferromagneticLa$_{0.7}$Ca$_{0.3}$MnO$_3$ in the spectral range of 0.7 - 6.5 eV. Withincreasing YBCO sublayer thickness, the optical spectral weight is enhanced atphoton energies of 1.5 - 3.5 eV. The spectral weight enhancement isproportional to the number of interfaces of each multilayer sample, indicatingits association with the interfacial electronic structure. Based oncalculations in the framework of a multilayer model, we find that the shape ofthe interface-induced spectral weight is consistent with transfer ofhole-carriers from YBCO to LCMO. Our results imply that the holes that aretransferred across the interfaces accumulate in the LCMO layers, rather thanbeing pinned by interfacial defects or annihilated by electron donors such asoxygen vacancies. Optical spectroscopy can thus serve as a non-destructiveprobe of charge transfer across buried interfaces in metal-oxideheterostructures.

Optical Characteristics of Charge Carrier Transfer across Interfaces between YBa$_2$Cu$_3$O$_{6+\delta}$ and La$_{0.7}$Ca$_{0.3}$MnO$_3$