Phonons and fractons in the vibration spectrum of the relaxor ferroelectric PbMg1/3Nb2/3O3

Autor:	Sergey Lushnikov, S. N. Gvasaliya, I. G. Siny
Rok vydání:	1999
Předmět:	Materials science Condensed matter physics Phonon Dielectric Condensed Matter Physics Electronic Optical and Magnetic Materials Vibration Condensed Matter::Materials Science symbols.namesake Fractal symbols Exponent Electrical and Electronic Engineering Raman spectroscopy Excitation Fracton
Zdroj:	Physica B: Condensed Matter. :286-289
ISSN:	0921-4526
DOI:	10.1016/s0921-4526(98)01359-3
Popis:	This paper describes the results of Raman and inelastic neutron-scattering studies for the PbMg1/3Nb2/3O3 (PMN) relaxor ferroelectric. The comparative analysis of the low-frequency region of the vibrational spectrum has revealed the excitation at the frequency of the order of 50 cm−1 which we regard as a fracton. In the generalized density of vibrational states this excitation corresponds to the portion of the curve with the exponent d =1.5 at T=77 K. Thus, we have observed a fracton in dielectric crystals for the first time and therefore we believe that fractal ideology can be used to describe the physical properties of the PMN relaxor ferroelectric.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6163eb6b1f447dd06b7ead23be0eb0bd https://doi.org/10.1016/s0921-4526(98)01359-3 Zobrazit plný text záznamu Full Text from ScienceDirect