Low Temperature Physics: 28, 516 (2002); https://doi.org/10.1063/1.1496660 (7 pages)
Физика Низких Температур: Том 28, Выпуск 7 (Июль 2002), c. 724-732    ( к оглавлению , назад )

Light scattering on phonons in quasi-one-dimensional antiferromagnet CsFeCl3·2H2O induced by magnetic ordering

V. S. Kurnosov

B.Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of the Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: Kurnosov@ilt.kharkov.ua

Yu. G. Pashkevich

A.Galkin Donetsk Physical and Technical Institute of the National Academy of Sciences of the Ukraine, 72 R.Luxemburg Str., Donetsk 83114, Ukraine

A. V. Peschanskii, V. I. Fomin, and A. V. Yeremenko

B.Verkin Institute for Low Temperature Physics and Engineering National Academy of Sciences of the Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine

Received February 1, 2002

Аннотация

The appearance of new phonon lines in the Raman spectrum of the quasi-one-dimensional antiferromagnet CsFeCl3·2H2O as a consequence of magnetic ordering with a change of the unit cell volume was detected experimentally. An analysis of the possible mechanisms that might lead to the observed spectral features is done. A new mechanism of inducing Raman scattering on phonons from the boundary of the paramagnetic Brillouin zone is hypothesized.

PACS:
71.45.-d - Collective effects
78.30.-j - Infrared and Raman spectra (for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.+x respectively)