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Nat Commun. 2013;4:2336. doi: 10.1038/ncomms3336.

Visualizing short-range charge transfer at the interfaces between ferromagnetic and superconducting oxides.

Author information

1
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA. tchien@uwyo.edu

Abstract

The interplay between antagonistic superconductivity and ferromagnetism has been a interesting playground to explore the interaction between competing ground states. Although this effect in systems of conventional superconductors is better understood, the framework of the proximity effect at complex-oxide-based superconductor/ferromagnet interfaces is not so clear. The main difficulty originates from the lack of experimental tools capable of probing the interfaces directly with high spatial resolution. Here we harness cross-sectional scanning tunnelling microscopy and spectroscopy together with atomic-resolution electron microscopy to understand the buried interfaces between cuprate and manganite layers. The results show that the fundamental length scale of the electronic evolution between YBa2Cu3O(7-δ) (YBCO) and La2/3Ca1/3MnO3 (LCMO) is confined to the subnanometre range. Our findings provide a complete and direct microscopic picture of the electronic transition across the YBCO/LCMO interfaces, which is an important step towards understanding the competition between ferromagnetism and superconductivity in complex-oxide heterostructures.

PMID:
23939385
DOI:
10.1038/ncomms3336

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