Volume dependence of the mode effective charge in multimode crystals

Anastassakis, E

dc.contributor.author	Anastassakis, E	en
dc.date.accessioned	2014-03-01T01:07:45Z
dc.date.available	2014-03-01T01:07:45Z
dc.date.issued	1989	en
dc.identifier.issn	0375-9601	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10138
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-45349109843&partnerID=40&md5=7d2610350651ec4effff0d218367f0c0	en
dc.subject.classification	Physics, Multidisciplinary	en
dc.title	Volume dependence of the mode effective charge in multimode crystals	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1989	en
heal.abstract	It is shown that in cubic (uniaxial) crystals with more than one (two) long-wavelength polar phonons, the volume dependence of the mode effective charge can be expressed in terms of such measurable quantities as the mode frequencies, their Grüneisen parameters, and the electronic values of optical constants. Sum rules are established and also conditions for the validity of the Lyddane-Sachs-Teller relation for individual modes. The analysis is based on the classical oscillator model without damping and assumes a general direction for the mode propagation. © 1989.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Physics Letters A	en
dc.identifier.isi	ISI:A1989AN07500010	en
dc.identifier.volume	139	en
dc.identifier.issue	9	en
dc.identifier.spage	465	en
dc.identifier.epage	470	en