Journal Article

PUBDB-2021-00142

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Orbital Hybridization and Magnetic Coupling at Cuprate–Manganite Interfaces Driven by Manganite Doping

Schlueter, C.DESY* ; Yang, N. ; Mazzoli, C. ; Cantoni, C. ; Tebano, A. ; Di Castro, D. ; Balestrino, G. ; Orgiani, P. ; Galdi, A. ; Herrero‐Martín, J. ; Gargiani, P. ; Valvidares, M. ; Aruta, C. (Corresponding author)

2020
Wiley-VCH Verlag Weinheim

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Please use a persistent id in citations: doi:10.1002/qute.202000016

Abstract: Fundamental understanding of interface mechanisms that generate unexpected physical properties in the cuprate/manganite heterostructures is essential for possible applications as spintronic devices. Here, CaCuO2/La1−xSrxMnO3 (CCO/LSMO) superlattices are investigated, where the infinite‐layer cuprate CCO does not have apical oxygen for Cu in the Ca‐plane so that the Mn–O–Cu superexchange coupling can be only present at the MnO2–(La,Sr)O–CuO2 interface. Two different doping states for the manganites are studied, namely x = 0.1 and x = 0.3, corresponding to the ferromagnetic insulating and ferromagnetic metallic states, respectively, in the manganite phase diagram. Linear and circular dichroism in X‐ray absorption by synchrotron radiation at Cu and Mn L‐edges clearly demonstrate that in the absence of apical oxygen in the cuprate block, the magnetic coupling between the LSMO and CCO is weakly ferromagnetic when LSMO is metallic, while it is antiferromagnetic when LSMO is insulating, along with an increased Cu 3d(3z2–r2) and Mn 3d(3z2–r2) orbital occupation. It is proposed that the Mn 3d valence band upward shift driven by the enhancement of Mn3+ content in the underdoped sample enhances the orbital hybridization. The stronger hybridization at the interface MnO2–(La,Sr)O–CuO2 gives rise to the antiferromagnetic coupling between cuprate and underdoped manganite.

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Contributing Institute(s):

1. Experimentebetreuung PETRA III (FS-PET-S)

Research Program(s):

1. 6214 - Nanoscience and Materials for Information Technology (POF3-621) (POF3-621)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2020

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Database coverage:
Clarivate Analytics Master Journal List ; DEAL Wiley ; Emerging Sources Citation Index ; NCBI Molecular Biology Database ; Web of Science Core Collection

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