Abnormal isotopic shift of the broad band in the (Mg1-xAlxB2)-B-10,11 superconductor

Parisiades, P; Lampakis, D; Palles, D; Liarokapis, E; Simonelli, L; Bianconi, A

dc.contributor.author	Parisiades, P	en
dc.contributor.author	Lampakis, D	en
dc.contributor.author	Palles, D	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Simonelli, L	en
dc.contributor.author	Bianconi, A	en
dc.date.accessioned	2014-03-01T01:56:27Z
dc.date.available	2014-03-01T01:56:27Z
dc.date.issued	2007	en
dc.identifier.issn	0921-4534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/28100
dc.subject	superconductivity	en
dc.subject	Raman scattering	en
dc.subject	MgB2	en
dc.subject	phonons	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	MGB2	en
dc.title	Abnormal isotopic shift of the broad band in the (Mg1-xAlxB2)-B-10,11 superconductor	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	We have studied the effect of aluminum doping and boron isotopic substitution on the Raman spectra of the (Mg1-xAlxB2)-B-10,11 Polycrystalline compounds. Our data show that new peaks appear at similar to 740 and 870 cm(-1) while the broad band at similar to 600 cm(-1) diminishes for higher Al doping levels. The high energy band evolves to the E-2g phonon mode of AlB2 corresponding to a strong reduction in the electron-phonon coupling. The isotopic shift for the broad band at similar to 600 cm(-1) is small considering the isotopic shift of the other bands, which follow the harmonic mass law. This extreme anharmonic behavior indicates that the broad band may not be directly related with the E-2g phonon of the B atoms. (c) 2007 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS	en
dc.identifier.isi	ISI:000249870500217	en
dc.identifier.volume	460	en
dc.identifier.spage	612	en
dc.identifier.epage	613	en