Substitution of Sc for Mg in MgB2: Effects on transition temperature and Kohn anomaly

Agrestini, S; Metallo, C; Filippi, M; Simonelli, L; Campi, G; Sanipoli, C; Liarokapis, E; De Negri, S; Giovannini, M; Saccone, A; Latini, A; Bianconi, A

dc.contributor.author	Agrestini, S	en
dc.contributor.author	Metallo, C	en
dc.contributor.author	Filippi, M	en
dc.contributor.author	Simonelli, L	en
dc.contributor.author	Campi, G	en
dc.contributor.author	Sanipoli, C	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	De Negri, S	en
dc.contributor.author	Giovannini, M	en
dc.contributor.author	Saccone, A	en
dc.contributor.author	Latini, A	en
dc.contributor.author	Bianconi, A	en
dc.date.accessioned	2014-03-01T01:21:19Z
dc.date.available	2014-03-01T01:21:19Z
dc.date.issued	2004	en
dc.identifier.issn	1098-0121	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16201
dc.subject	Chemical Potential	en
dc.subject	Critical Temperature	en
dc.subject	Electronic Topological Transition	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	boron	en
dc.subject.other	magnesium	en
dc.subject.other	scandium	en
dc.subject.other	article	en
dc.subject.other	chemical analysis	en
dc.subject.other	chemical modification	en
dc.subject.other	conductance	en
dc.subject.other	superconductor	en
dc.subject.other	synthesis	en
dc.subject.other	temperature	en
dc.title	Substitution of Sc for Mg in MgB2: Effects on transition temperature and Kohn anomaly	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevB.70.134514	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevB.70.134514	en
heal.identifier.secondary	134514	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	Here we report the synthesis and characterization of Mg 1-xScxB2 (0.12<x<0.27) system, with critical temperature in the range of 30 > Tc > 6 K. We find that the Sc doping moves the chemical potential through the 2-D/3-D electronic topological transition (ETT) in the σ band where the ""shape resonance"" of interband pairing occurs. In the 3-D regime beyond the ETT we observe a hardening of the E2g Raman mode with a significant line-width narrowing due to the suppression of the Kohn anomaly over the range 0<q<2kF.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	Physical Review B - Condensed Matter and Materials Physics	en
dc.identifier.doi	10.1103/PhysRevB.70.134514	en
dc.identifier.isi	ISI:000224855000099	en
dc.identifier.volume	70	en
dc.identifier.issue	13	en
dc.identifier.spage	134514	en
dc.identifier.epage	1-134514-5	en