Depth-resolved charge reconstruction at the LaNiO3/CaMnO3 interface

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

منو

" Depth-resolved charge reconstruction at the LaNiO3/CaMnO3 interface "
Chandrasena, RU; Flint, CL; Yang, W; Arab, A; Nemšák, S; Gehlmann, M; Özdöl, VB; Bisti, F; Wijesekara, KD; Meyer-Ilse, J; Gullikson, E; Arenholz, E; Ciston, J; Schneider, CM; Strocov, VN; Suzuki, Y; Gray, AX

Document Type	:	AL
Record Number	:	908081
Doc. No	:	LA35c5r96d
Title & Author	:	Depth-resolved charge reconstruction at the LaNiO3/CaMnO3 interface [Article]\ Chandrasena, RU; Flint, CL; Yang, W; Arab, A; Nemšák, S; Gehlmann, M; Özdöl, VB; Bisti, F; Wijesekara, KD; Meyer-Ilse, J; Gullikson, E; Arenholz, E; Ciston, J; Schneider, CM; Strocov, VN; Suzuki, Y; Gray, AX
Date	:	2018
Title of Periodical	:	Lawrence Berkeley National Laboratory
Abstract	:	© 2018 American Physical Society. 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.