Direct measurement of charge transfer phenomena at ferromagnetic/superconducting oxide interfaces

2005/08/23 by M. Varela, Varela, M., Andrew R. Lupini +20
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Other Condensed Matter (cond-mat.other) #Physics of Superconductivity and Magnetism #cond-mat.other

paper · pdf · doi:10.48550/arxiv.cond-mat/0508564

16 pages, 4 figures

openalex publication_date 2005/08/23 · arxiv created 2006/05/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

YBa2Cu3O7-x/La0.67Ca0.33MnO3 ferromagnetic/superconducting interfaces are analyzed by scanning transmission electron microscopy and electron energy loss spectroscopy with monolayer resolution. We demonstrate that extensive charge transfer occurs between the manganite and the superconductor, in a manner similar to modulation-doped semiconductors, which explains the reduced critical temperatures of heterostructures. This behavior is not seen with insulating PrBa2Cu3O7 layers. Furthermore, we confirm directly that holes in the YBa2Cu3O7-x are located on the CuO2 planes.

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