Isotope effect on the E2g phonon and mesoscopic phase separation near the electronic topological transition in Mg1-x Alx B2

Simonelli, L; Palmisano, V; Fratini, M; Filippi, M; Parisiades, P; Lampakis, D; Liarokapis, E; Bianconi, A

dc.contributor.author	Simonelli, L	en
dc.contributor.author	Palmisano, V	en
dc.contributor.author	Fratini, M	en
dc.contributor.author	Filippi, M	en
dc.contributor.author	Parisiades, P	en
dc.contributor.author	Lampakis, D	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Bianconi, A	en
dc.date.accessioned	2014-03-01T01:30:58Z
dc.date.available	2014-03-01T01:30:58Z
dc.date.issued	2009	en
dc.identifier.issn	1098-0121	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19695
dc.subject	aluminium compounds	en
dc.subject	electron-phonon interactions	en
dc.subject	Fermi level	en
dc.subject	Fermi surface	en
dc.subject	high-temperature superconductors	en
dc.subject	isotope effects	en
dc.subject	magnesium compounds	en
dc.subject	mesoscopic systems	en
dc.subject	phase separation	en
dc.subject	Raman spectra	en
dc.subject	superconducting transitions	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	MGB2 2-GAP SUPERCONDUCTIVITY	en
dc.subject.other	T-C SUPERCONDUCTIVITY	en
dc.subject.other	CRITICAL-TEMPERATURE	en
dc.subject.other	CUPRATE PEROVSKITES	en
dc.subject.other	CRITICAL-POINT	en
dc.subject.other	MICRO-STRAIN	en
dc.subject.other	AL	en
dc.subject.other	SUPERSTRIPES	en
dc.subject.other	LATTICE	en
dc.subject.other	DRIVEN	en
dc.title	Isotope effect on the E2g phonon and mesoscopic phase separation near the electronic topological transition in Mg1-x Alx B2	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevB.80.014520	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevB.80.014520	en
heal.identifier.secondary	014520	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	We report boron isotope effect on the E2g phonon mode by micro-Raman spectroscopy on the ternary Mg1-x Alx B2 system, synthesized with pure isotopes B 10 and B 11. The isotope coefficient on the E2g mode frequency is nearly 0.5 in the wide range of Al, with a tendency to decrease at MgB2 (x=0). The intraband electron-phonon (e-ph) coupling relative to the sigma band has been extracted from the E2g line-shape parameters. By tuning the Fermi energy near the electronic topological transition (ETT), where the sigma Fermi surface changes from two-dimensional to three-dimensional topology (in range 0<x<0.28), the E2g mode shows the Kohn anomaly accompanied with a splitting into a hard and a soft component. The results suggest that the intraband hardly plays any role to control the high Tc of Mg1-x Alx B2 The common physical features of diborides with the multigap FeAs-based superconductors and cuprates are discussed. © 2009 The American Physical Society.	en
heal.publisher	AMER PHYSICAL SOC	en
heal.journalName	Physical Review B - Condensed Matter and Materials Physics	en
dc.identifier.doi	10.1103/PhysRevB.80.014520	en
dc.identifier.isi	ISI:000268617100111	en
dc.identifier.volume	80	en
dc.identifier.issue	1	en