ePubs

The open archive for STFC research publications

PURL issue currently affecting ePubs. Persistent Uniform Resource Locator (PURL) links in ePubs are not currently working. This is due to a cyber incident that has affected the third-party provider of the PURL system. We are hopeful that this issue will be resolved shortly.

Full Record Details

Persistent URL http://purl.org/net/epubs/work/34477
Record Status Checked
Record Id 34477
Title Inelastic neutron scattering study of phonons and magnetic excitations in LaCoO3
Contributors
Abstract We have investigated the phonon and the magnetic excitations in LaCoO3 by inelastic neutron scattering measurements. The acoustic phonon dispersions show some characteristic features of the folded Brillouin zone (BZ) for the rhombohedrally distorted perovskite structure containing two chemical formula units of LaCoO3 in the unit cell. We observed two transverse optical (TO) phonon branches along (d d d), consistent with previously reported Raman active Eg modes which show remarkable softening associated with the spin-state transition [Ishikawa et al., Phys. Rev. Lett. 93, 136401 (2004)]. We found that the softening takes place in the TO mode over the whole BZ. In contrast, the acoustic phonons show no anomalous softening associated with the spin-state transition. The low-energy paramagnetic scattering at 8 K is weak, increasing towards a maximum at E>=~15 meV, consistent with excitation of the nonmagnetic low-spin to magnetic intermediate-spin state of Co3+ ions.
Organisation CCLRC , ISIS , ISIS-PRISMA
Keywords ISIS 2006 , Physics
Funding Information
Related Research Object(s):
Licence Information:
Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article Phys Rev B 72 (2005): 174405. doi:10.1103/PhysRevB.72.174405 2005