Propagacja dźwięku w pobliżu przemiany fazowej
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Date
2004
Authors
Advisor
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Journal Title
Journal ISSN
Volume Title
Publisher
Wydawnictwo Naukowe UAM
Title alternative
Sound propagation near the magnetic phase transition
Abstract
The book deals with the theoretical studies of critical behaviour of ultrasonic wave
attenuation and propagation velocity in magnets. The effect of spin-lattice relaxation on the ultrasonic attenuation and velocity is investigated on the basis of the
stochastic model including the energy relaxation and the sound mode. A novel high frequency regime in the ultrasonic attenuation is predicted. The scaling functions are calculated in the one-loop approximation within the renormalisation group formalism. In the diffusive version of the model a detailed analysis of the connection between the heat conduction and sound propagation is studied. An overview of experimental and theoretical sound attenuation exponents is also given. The ultrasonic attenuation measurements in MnF2 are interpreted in terms of the theoretical model proposed.
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Keywords
sound propagation, phase transitions
Citation
Pawlak, A. Propagacja dźwięku w pobliżu przemiany fazowej. Poznań: Wydawnictwo Naukowe UAM, 2004.
ISBN
83-232-1420-4