Raman spectroscopy of orthorhombic La1-xCaxMnO3, x=0.1-0.3

Citation
Ae. Pantoja et al., Raman spectroscopy of orthorhombic La1-xCaxMnO3, x=0.1-0.3, J PHYS-COND, 13(16), 2001, pp. 3741-3752
Citations number
38
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
0953-8984 → ACNP
Volume
13
Issue
16
Year of publication
2001
Pages
3741 - 3752
Database
ISI
SICI code
0953-8984(20010423)13:16<3741:RSOOLX>2.0.ZU;2-X
Abstract
This paper reports polarization-resolved temperature-dependent Raman scatte ring measurements on single crystals of the orthorhombic perovskite colossa l-magnetoresistive material La1-xCaxMnO3, with x = 0.1, 0.275, 0.3. It is d emonstrated that two of the Raman Lines undergo an anomalous softening as t emperature is lowered through Tc, related to the development of magnetic or der below ambient temperature. Also reported is the presence of second-orde r scattering, as has been previously predicted for the manganites, Only the broad features at 500 and 650 cm(-1) that arise from disorder-induced scat tering contribute to the second-order signal.