| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
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|
|---|---|---|
| Page(s) | C6-468 - C6-470 | |
| DOI | https://doi.org/10.1051/jphyscol:19816136 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-468-C6-470
DOI: 10.1051/jphyscol:19816136
Department of Physics, Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213, U.S.A.
J. Phys. Colloques 42 (1981) C6-468-C6-470
DOI: 10.1051/jphyscol:19816136
ELASTIC MODULI OF LINEAR ANTIFERROMAGNET CsNiCl3
K.R. Mountfield et J.A. RayneDepartment of Physics, Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213, U.S.A.
Abstract
The elastic constants of the linear chain antiferromagnet CsNiCl3 have been measured using a phase comparison method. At 295 K the measurements give C11=3.58±0.07, C33=6.25±0.12, C44=0.60±0.10, C66=(C11-C12)/2 = 1.12±0.02 and C13=1.0±0.2 in units of 1011 dyne cm-2. The corresponding bulk modulus is 2.2±0.4 x 1011 dyne cm-2 compared to the value 2.5 x 1011 dyne cm-2 estimated from thermal expansion data. C33 clearly shows the effects of magnetic ordering along the chains near 30 K and of the spin rearrangement associated with three-dimensional magnetic order near 4.4 K. The former is consistent with a spin-phonon interaction involving magnetostrictive coupling through the intrachain exchange constant.