Central peak and narrow component in x-ray scattering near the displacive phase transition in SrTi0{sub 3}.
The second-order displacive phase transition in SrTiO{sub 3} at T{sub c} {approx} 105 K has been the subject of much debate. For temperature T above and near T{sub c}, energy scans by neutron scattering have shown a central peak (CP) at the R point in the Brillouin zone in addition to a pair of soft phonon peaks, while momentum scans by x-ray thermal diffuse scattering around the R point have shown a narrow component (NC) atop a broad thermal peak caused by the soft mode. This work clarifies the relationship between the CP and NC by inelastic x-ray scattering with high energy and momentum resolutions. The CP and NC are derived from the same origin and can be attributed to defect-induced local transition above T{sub c}.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); Petroleum Foundation Fund
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 984690
- Report Number(s):
- ANL/XSD/JA-62164; ISSN 1550-235X; TRN: US1005960
- Journal Information:
- Phys. Rev. B, Vol. 78, Issue 2008; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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