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Atomically precise interfaces from non-stoichiometric deposition


Abstract: Complex oxide heterostructures display some of the most chemically abrupt, atomically precise interfaces, which is advantageous when constructing new interface phases with emergent properties by juxtaposing incompatible ground states. One might assume that atomically precise interfaces result from stoichiometric growth. Here we show that the most precise control is, however, obtained by using deliberate and specific non-stoichiometric growth conditions. For the precise growth of Sr n+1 Ti n O n+1 Ruddlesden-Popper (RP) phases, stoichiometric deposition leads to the loss of the first RP rock-salt double layer, but growing with a strontium-rich surface layer restores the bulk stoichiometry and ordering of the subsurface RP structure. Our results dramatically expand the materials that can be prepared in epitaxial heterostructures with precise interface control-from just the n=â ^end members (perovskites) to the entire RP homologous series-enabling the exploration of novel quantum phenomena at a richer variety of oxide interfaces.



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 Fuente: NATURE COMMUNICATIONS 5:4530

Editorial: Nature Publishing Group

 Fecha de publicación: 03/08/2014

Nº de páginas: 8

Tipo de publicación: Artículo de Revista

DOI: 10.1038/ncomms5530

ISSN: 2041-1723

Url de la publicación: http://www.nature.com/ncomms/2014/140804/ncomms5530/full/ncomms5530.html

Autores/as

NIE, YUEFENG
ZHU, Y.
LEE, CHEHUI
KOURKOUTIS, LENA FITTING ITTING
GHOSEZ, PHILIPPE H.
BAEK, D. J.
SUNG, S.
XI, XIAOXING
SHEN, KYLE
MULLER, DAVID A.
SCHLOM, DARRELL G.