ISSN:
1434-6036
Keywords:
PACS. 64.70.Rh Commensurate-incommensurate transitions - 62.20.-x Mechanical properties of solids - 78.35.+c Brillouin and Rayleigh scattering; other light scattering
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: Transverse and pseudo-transverse elastic waves have been studied in several scattering geometries in order to investigate the temperature dependences of C E 66 and C E 14 over the range 300-1100 K, including the transitions near 860 K. These results complete those on C E 44 we have obtained in a previous work. All these constants display discontinuities at the lock-in transition. In the phase, the results are analysed in term of lowest order couplings between strains (e) and the order parameter (Q). The main features are described by the lowest order biquadratic e2Q2 coupling, in particular for C E 44 in a large temperature range. However, it appears that a contribution of the next coupling term arises for C E 66 below K and that the first two lowest order terms have to be taken into account even just below the lock-in transition in the case of C E 14 . The temperature dependence of Q has been deduced and it can be well described in the framework of Landau's theory.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050278
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