The University of Southampton
University of Southampton Institutional Repository

Angular dispersion of phonons in biaxial NaNO2

Record type: Article

Angular dispersion curves for polar phonons in biaxial crystals are experimentally verified for sodium nitrite. Both crossing and repulsion of phonons are expected and observed, and an important difference between biaxial and uniaxial crystals is noted.

Die Dispersionskurven für richtungsabhängige polare Phononen in zweiachsigen Kristallen werden experimentell für Nattriumnitrit verifiziert. Sowhol Überkreuzung als auch Abstoßung von Phononenzweigen werden erwartet und experimentell bestätit. Es wird ein beträchtlicher Unterschied zwischen zweiachsigen und einachsigen Kristallen beobachtet.

Full text not available from this repository.

Citation

Bonilla, I.R. and Rutt, H.N. (1975) Angular dispersion of phonons in biaxial NaNO2 Physica Status Solidi (b), 69, (2), pp. 395-398. (doi:10.1002/pssb.2220690210).

More information

Published date: June 1975
Additional Information: The angular dispersion (kph ? ?/c) of polar phonons in the region of the ?3,-states of the SO42?-ions in biaxial MgSO4, · 7 H2O has been observed with Raman-scattering experiments at T = 300 K and T = 1.9 K. The agreement of the experimental data with the existing theories of angular dispersion is very satisfying. Some accidental degeneracies of transverse with longitudinal states of different symmetry could be observed. This degeneracy, where the two branches cross with equal slopes of opposite signs, can be lifted due to the temperature dependence of the frequencies. This behaviour is also interpreted theoretically and some simple relations are derived for the slopes and the curvature of dispersion branches, which relate these data to the effective charges and the dielectric function ?(?), and which characterize the critical points occuring on the dispersion branches.Text in English and German.
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 258462
URI: http://eprints.soton.ac.uk/id/eprint/258462
ISSN: 0370-1972
PURE UUID: 01b89239-9d2f-498c-b045-d2a67f6ccf31

Catalogue record

Date deposited: 05 Nov 2003
Last modified: 17 Jul 2017 13:58

Export record

Altmetrics

Contributors

Author: I.R. Bonilla
Author: H.N. Rutt

University divisions


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×