Raman investigations of C-, Li- and Mn-doped MgB2

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

dc.contributor.author	Parisiades, P	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	2014-03-01T02:46:29Z
dc.date.available	2014-03-01T02:46:29Z
dc.date.issued	2009	en
dc.identifier.issn	1557-1939	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32670
dc.subject	MgB2	en
dc.subject	Raman spectroscopy	en
dc.subject	Superconductivity	en
dc.subject.classification	Physics, Applied	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	Atomic substitutions	en
dc.subject.other	Broad bands	en
dc.subject.other	Diborides	en
dc.subject.other	Electronic topological transitions	en
dc.subject.other	Inter-dependences	en
dc.subject.other	Magnetic impurities	en
dc.subject.other	MgB <sub>2</sub>	en
dc.subject.other	Phonon couplings	en
dc.subject.other	Raman investigations	en
dc.subject.other	Raman studies	en
dc.subject.other	Transition temperatures	en
dc.subject.other	Borides	en
dc.subject.other	Critical current density (superconductivity)	en
dc.subject.other	Crystal impurities	en
dc.subject.other	Doping (additives)	en
dc.subject.other	Electric conductivity	en
dc.subject.other	Manganese	en
dc.subject.other	Manganese compounds	en
dc.subject.other	Phonons	en
dc.subject.other	Raman scattering	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Single crystals	en
dc.subject.other	Spectrum analysis	en
dc.subject.other	Superconductivity	en
dc.subject.other	Penetration depth (superconductivity)	en
dc.title	Raman investigations of C-, Li- and Mn-doped MgB2	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1007/s10948-008-0402-4	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s10948-008-0402-4	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	A systematic micro-Raman study of the atomic substitution effects has been carried out on single crystals of MgB2, including C-doping for B and Li- or Mn-doping for Mg. The spectra of C (electron)-doped compounds exhibit remarkable differentiations with respect to pure MgB2, and new bands of E2g and A1g/B1g symmetry play the dominant role in the substituted spectra. We have observed a two-mode behavior apparently driven by the electron-phonon coupling strength and associated with an electronic topological transition of the σ bands. On the other hand, Li (hole) and Mn (magnetic impurity) doping do not seem to affect the well-defined broad band at 600 cm-1. Combining Raman investigations and Tc -interdependence shows that this band is not related with the transition temperature, questioning its relationship to superconductivity in diborides. © 2008 Springer Science+Business Media, LLC.	en
heal.publisher	SPRINGER	en
heal.journalName	Journal of Superconductivity and Novel Magnetism	en
dc.identifier.doi	10.1007/s10948-008-0402-4	en
dc.identifier.isi	ISI:000262315900013	en
dc.identifier.volume	22	en
dc.identifier.issue	2	en
dc.identifier.spage	169	en
dc.identifier.epage	172	en