Local Symmetry Breaking in the Bulk and in Domain Boundaries: Breit–Wigner Damping of Phonons and Acoustic Resonances

Salje, E. K. H. and Carpenter, M. A. (2012) Local Symmetry Breaking in the Bulk and in Domain Boundaries: Breit–Wigner Damping of Phonons and Acoustic Resonances. Ferroelectrics, 433 (1). pp. 111-122. ISSN 0015-0193 DOI 10.1080/00150193.2012.678152

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Abstract

It is proposed that Breit-Wigner damping and the appearance of Fano profiles in Raman, Brillouin and resonant ultrasound spectroscopy can be fingerprints for structural disorder and dissipation with a broad excitation spectrum (e.g. heterogeneous distributions of nanodomains), which typically occurs in multiferroic materials. Changes in line shapes from Lorentzian occur by coupling of the normal phonon mode or mechanical resonance with a broad excitation to give a characteristic asymmetry. The detailed features of the resulting Fano profile functions are derived and examples are given for bulk coupling in Raman spectra and interface related couplings in resonant ultrasound spectra related to the dynamics of domain walls. Examples of fano-profiles in BaTiO3 and SrTiO3 are discussed and the broad Breit-Wigner spectrum is associated with the disordering of Ti and Sr, respectively.

Item Type:	Article
Uncontrolled Keywords:	2012AREP; IA64;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Ferroelectrics
Volume:	433
Page Range:	pp. 111-122
Identification Number:	10.1080/00150193.2012.678152
Depositing User:	Sarah Humbert
Date Deposited:	29 Oct 2012 17:04
Last Modified:	23 Jul 2013 10:04
URI:	http://eprints.esc.cam.ac.uk/id/eprint/2611

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