Raman spectroscopy of ferromagnetic CrO2
Citation:
M. N. Iliev, A. P. Litvinchuk, H-G Lee, C. W. Chu, A Barry and J. M. D. Coey 'Raman spectroscopy of ferromagnetic CrO2' in Physical Review B, 60, (1), 1999, pp 33 - 36Download Item:
Abstract:
Polarized Raman spectra of the ferromagnetic metal CrO2 were measured in a broad temperature range
including Tc'390 K. The Raman-allowed modes of A1g , B1g , B2g , and Eg symmetry were identified and
compared to the corresponding modes of isostructural TiO2. The two low-frequency Raman lines are relatively
narrow, indicating weak scattering of the corresponding B1g and Eg phonons. Whereas the Raman intensities
are not visibly affected by the magnetic ordering, the dependences on temperature of the phonon wave numbers
exhibit peculiarities that could be attributed to a spin-phonon interaction. The variations with T of the phonon
linewidths follow at low temperatures the dependence expected for phonon-phonon scattering. An additional
broadening at higher temperatures with a maximum near Tc is tentatively assigned to scattering from collective
spin fluctuations.
Author's Homepage:
http://people.tcd.ie/jcoeyDescription:
PUBLISHED
Author: COEY, JOHN MICHAEL DAVID
Publisher:
American Physical SocietyCollections
Series/Report no:
Physical Review B60
1
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