Journal Article

FZJ-2019-00556

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Depth-resolved charge reconstruction at the LaNi O 3 / CaMn O 3 interface

Chandrasena, R. U. ; Flint, C. L. ; Yang, W. (Editor)Extern* ; Arab, A. ; Nemsak, S.FZJ* ; Gehlmann, M. ; Özdöl, V. B. ; Bisti, F. ; Wijesekara, K. D. ; Meyer-Ilse, J. ; Gullikson, E. ; Arenholz, E. ; Ciston, J. ; Schneider, C. M.FZJ* ; Strocov, V. N. ; Suzuki, Y. ; Gray, A. X. (Corresponding author)

2018
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/21332  doi:10.1103/PhysRevB.98.155103

Abstract: Rational design of low-dimensional electronic phenomena at oxide interfaces is currently considered to be one of the most promising schemes for realizing new energy-efficient logic and memory devices. An atomically abrupt interface between paramagnetic LaNiO3 and antiferromagnetic CaMnO3 exhibits interfacial ferromagnetism, which can be tuned via a thickness-dependent metal-insulator transition in LaNiO3. Once fully understood, such emergent functionality could turn this archetypal Mott-interface system into a key building block for the above-mentioned future devices. Here, we use depth-resolved standing-wave photoemission spectroscopy in conjunction with scanning transmission electron microscopy and x-ray absorption spectroscopy, to demonstrate a depth-dependent charge reconstruction at the LaNiO3/CaMnO3 interface. Our measurements reveal an increased concentration of Mn3+ and Ni2+ cations at the interface, which create an electronic environment favorable for the emergence of interfacial ferromagnetism mediated via the Mn4+−Mn3+ ferromagnetic double exchange and Ni2+−O−Mn4+ superexchange mechanisms. Our findings suggest a strategy for designing functional Mott oxide heterostructures by tuning the interfacial cation characteristics via controlled manipulation of thickness, strain, and ionic defect states.

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Contributing Institute(s):

1. Elektronische Eigenschaften (PGI-6)

Research Program(s):

1. 522 - Controlling Spin-Based Phenomena (POF3-522) (POF3-522)

Appears in the scientific report 2018

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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