Analysis of ultrasonic anomaly in V3Si

Dattagupta, S. ; Venkataraman, G. (1979) Analysis of ultrasonic anomaly in V3Si Pramana - Journal of Physics, 13 (3). pp. 205-218. ISSN 0304-4289

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V3Si exhibits an ultrasonic anomaly when cooled well below its martensitic and superconducting transition temperatures (Tm and Tc), and a magnetic field is applied on to the sample. The anomaly is thought to be due to reorientation of microdomains formed below Tm, to energetically favourable configurations. The effect disappears when the domains are stabilised in new configurations in the presence of the magnetic field. An analysis of these results is presented in this paper by relating the ultrasonic attenuation coefficient to strain fluctuations, arising here from domain reorientations. The treatment is based on a master equation for the probability matrix whose elements yield the probabilities of transitions between domain configurations, in the presence of both the magnetic field and the stress wave. Arguments for the validity of this master equation, when the oscillatory stress is weak, are given in a longish appendix. The derived results are used to analyse, in qualitative terms, the observed experimental facts. Also, new measurements are suggested which may help interpret the experimental data in a satisfactory manner.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:A-15 Compounds; Ultrasonic Attenuation; Magnetostriction; Strain Fluctuations
ID Code:55763
Deposited On:19 Aug 2011 03:11
Last Modified:18 May 2016 07:53

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