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Structural dynamics of LaVO3 on the nanosecond time scale.
Brahlek, Matthew; Stoica, Vladimir A; Lapano, Jason; Zhang, Lei; Akamatsu, Hirofumi; Tung, I-Cheng; Gopalan, Venkatraman; Walko, Donald A; Wen, Haidan; Freeland, John W; Engel-Herbert, Roman.
Afiliación
  • Brahlek M; Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16801, USA.
  • Lapano J; Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16801, USA.
  • Zhang L; Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16801, USA.
  • Akamatsu H; Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16801, USA.
  • Tung IC; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  • Walko DA; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  • Wen H; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  • Freeland JW; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Struct Dyn ; 6(1): 014502, 2019 Jan.
Article en En | MEDLINE | ID: mdl-30868087
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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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Struct Dyn Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Struct Dyn Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos