Published May 1, 2006
| Version v1
Journal article
Neutron scattering study of phonons in LaCoO3
Creators
- 1. Department of Applied Physics and Chemistry, University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi, Tokyo 182-8585 (Japan)
- 2. Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
- 3. Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara 229-8551 (Japan)
- 4. ISIS, Rutherford Appleton Laboratory, Didcot OX110QX (United Kingdom)
- 5. Brookhaven National Laboratory, New York, NY 11973 (United States)
Description
We have investigated phonons with the inelastic neutron scattering in order to study the 100K spin-state transition (ST) in LaCoO3. The acoustic phonon dispersions show some characteristic features of the folded Brillouin zone (BZ) of the rhombohedrally distorted perovskite structure containing two chemical formula of LaCoO3 in the unit cell. The optical phonons of the Eg rotational modes of O atoms and the Eg vibration mode of La atoms show a remarkable softening above the ST. The softening is most pronounced at R-point of the pseudo-cubic reciprocal lattice but covers almost whole region of the Brillouin zone. In contrast, the acoustic phonons show no such softening associated with the ST
Additional details
Identifiers
- DOI
- 10.1016/j.physb.2006.01.242;
- PII
- S0921-4526(06)00256-0;
Publishing Information
- Journal Title
- Physica. B, Condensed Matter
- Journal Volume
- 378-380
- Journal Page Range
- p. 532-533
- ISSN
- 0921-4526
- CODEN
- PHYBE3
Conference
- Title
- International conference on strongly correlated electron systems
- Acronym
- SCES 2005
- Dates
- 26-30 Jul 2005
- Place
- Vienna (Austria)
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 38070308
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ATOMS; BRILLOUIN ZONES; CRYSTAL STRUCTURE; INELASTIC SCATTERING; LANTHANUM COMPOUNDS; NEUTRON DIFFRACTION; OSCILLATION MODES; PEROVSKITE; PHASE TRANSFORMATIONS; PHONONS; SPIN; TEMPERATURE DEPENDENCE
- Descriptors DEC
- ANGULAR MOMENTUM; COHERENT SCATTERING; DIFFRACTION; MINERALS; OXIDE MINERALS; PARTICLE PROPERTIES; PEROVSKITES; QUASI PARTICLES; RARE EARTH COMPOUNDS; SCATTERING; ZONES
Optional Information
- Copyright
- Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.