Untilting BiFeO3: The influence of substrate boundary conditions in ultra-thin BiFeO3 on SrTiO3 | Zendy

Yongsoo Yang | Zendy; Christian M. Schlepütz | Zendy; Carolina Adamo | Zendy; Darrell G. Schlom | Zendy; Roy Clarke | Zendy

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Untilting BiFeO3: The influence of substrate boundary conditions in ultra-thin BiFeO3 on SrTiO3

Author(s) -

Yongsoo Yang,

Christian M. Schlepütz,

Carolina Adamo,

Darrell G. Schlom,

Roy Clarke

Publication year - 2013

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4827596

Subject(s) - monoclinic crystal system , tetragonal crystal system , materials science , octahedron , crystallography , phase transition , thin film , condensed matter physics , phase (matter) , reciprocal lattice , perovskite (structure) , phase boundary , diffraction , crystal structure , optics , nanotechnology , chemistry , physics , organic chemistry

We report on the role of oxygen octahedral tilting in the monoclinic-to-tetragonal phase transition in ultra-thin BiFeO3 films grown on (001) SrTiO3 substrates. Reciprocal space maps clearly show the disappearance of the integer-order Bragg peak splitting associated with the monoclinic phase when the film thickness decreases below 20 unit cells. This monoclinic-to-tetragonal transition is accompanied by the evolution of the half-order diffraction peaks, which reflects untilting of the oxygen octahedra around the [110] axis, proving that the octahedral tilting is closely correlated with the transition. This structural change is thickness-dependent, and different from a strain-induced transition in the conventional sense

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