Acoustic phonons in the hexagonal perovskite CsNiCl3 around the Gamma-point
The acoustic phonon dispersion curves of the hexagonal perovskite CsNiCl3 were measured at room temperature in the vicinity of the Gamma-point along the [0 0 1] and [1 1 0] directions. The derived velocity of sound values for the longitudinal and transverse acoustic phonons are compared with the velocity of sound values from ultrasound and Brillouin scattering measurements as well as model calculations using the GULP code.
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Rutherford Appleton Lab, ISIS Facil, CLRC, Didcot OX11 0QX, Oxon, England. Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England. Tech Univ Delft, IRI, NL-2629 JB Delft, Netherlands. Royal Inst Great Britain, London W1X 4BS, England. Riso Natl Lab, D-4000 Roskilde, Denmark. Rijksuniv Leiden, Gorlaeus Labs, LIC, NL-2300 RA Leiden, Netherlands. Visser, D, Rutherford Appleton Lab, ISIS Facil, CLRC, Didcot OX11 0QX, Oxon, England.
REVIEWED
EPFL