Structural dynamics of LaVO3 on the nanosecond time scale
Due to the strong dependence of electronic properties on the local bonding environment, a full characterization of the structural dynamics in ultrafast experiments is critical. Here, we report the dynamics and structural refinement at nanosecond time scales of a perovskite thin film by combining opt...
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Veröffentlicht in: | Structural dynamics (Melville, N.Y.) N.Y.), 2019-01, Vol.6 (1), p.014502-014502 |
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Sprache: | eng |
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Zusammenfassung: | Due to the strong dependence of electronic properties on the local bonding
environment, a full characterization of the structural dynamics in ultrafast
experiments is critical. Here, we report the dynamics and structural refinement
at nanosecond time scales of a perovskite thin film by combining optical
excitation with time-resolved X-ray diffraction. This is achieved by monitoring
the temporal response of both integer and half-integer diffraction peaks of
LaVO3 in response to an above-band-gap 800 nm pump pulse.
We find that the lattice expands by 0.1% out of plane, and the relaxation
is characterized by a biexponential decay with 2 and 12 ns time scales.
We analyze the relative intensity change in half-integer peaks and show that the
distortions to the substructure are small: the oxygen octahedral rotation angles
decrease by ∼0.3° and La displacements decrease by
∼0.2 pm, which directly corresponds to an ∼0.8°
increase in the V-O-V bond-angles, an in-plane V-O bond length reduction of
∼0.3 pm, and an unchanged out-of-plane bond length. This
demonstration of tracking the atomic positions in a pump-probe experiment
provides experimentally accessible values for structural and electronic
tunability in this class of materials and will stimulate future experiments. |
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ISSN: | 2329-7778 2329-7778 |
DOI: | 10.1063/1.5045704 |