Two-mode behavior for the E2g broad band in Mg(B1-xCx)2

Parisiades, P; Lampakis, D; Palles, D; Liarokapis, E; Zhigadlo, ND; Katrych, S; Karpinski, J

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	Zhigadlo, ND	en
dc.contributor.author	Katrych, S	en
dc.contributor.author	Karpinski, J	en
dc.date.accessioned	2014-03-01T01:29:25Z
dc.date.available	2014-03-01T01:29:25Z
dc.date.issued	2008	en
dc.identifier.issn	0921-4534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19257
dc.subject	MgB2	en
dc.subject	Raman spectroscopy	en
dc.subject	Superconductivity	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	Crystallography	en
dc.subject.other	Raman studies	en
dc.subject.other	Systematic (CO)	en
dc.subject.other	Two mode behavior	en
dc.subject.other	Single crystals	en
dc.title	Two-mode behavior for the E2g broad band in Mg(B1-xCx)2	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.physc.2008.05.219	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.physc.2008.05.219	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	A systematic Raman study has been carried out on single crystals of Mg(B1-x,C-x)(2) with carbon concentrations in the range of x = 0.0-0.15. We have found remarkable differentiations of the Raman spectra with doping. Even with small amounts of carbon substitution (x = 0.027) the E-2g-symmetry broad band at similar to 600cm(-1) (for pure MgB2) diminishes and new modes appear of the approximate A(1g)/B-1g (similar to 750 cm(-1)) and E-2g (similar to 850 cm(-1)) symmetries, though the transition temperature is only slightly reduced (< 2 K). The broadband does not evolve continuously into the mode of same symmetry at similar to 850 cm(-1), as assumed by other investigators, The practical disappearance of the original similar to 600 cm(-1) mode at x similar or equal to 0.08 coincides with the fast reduction of T-c. The doping dependence of the phonons indicates a two-mode behavior, which could be driven by the 2D-3D electronic topological transition and associated with a possible nanoscale phase separation. (c) 2008 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Physica C: Superconductivity and its Applications	en
dc.identifier.doi	10.1016/j.physc.2008.05.219	en
dc.identifier.isi	ISI:000258817400013	en
dc.identifier.volume	468	en
dc.identifier.issue	14	en
dc.identifier.spage	1064	en
dc.identifier.epage	1069	en