Isotope Effect and Phonon Softening in Superconducting Borocarbides and Boronitrides

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buir.contributor.authorHakioǧlu, Tuğrul
dc.citation.epage872en_US
dc.citation.issueNumber9en_US
dc.citation.spage863en_US
dc.citation.volumeNumber22en_US
dc.contributor.authorHakioǧlu, Tuğrulen_US
dc.contributor.authorIvanov, V. A.en_US
dc.date.accessioned2016-02-08T10:43:03Z
dc.date.available2016-02-08T10:43:03Z
dc.date.issued1998en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractThe isotope effect in the recently disvovered class o superconductors LuNi2B2C and La3Ni2B2N3 is investigated in the context of electron-squezed phonon interaction renormalizing the Ni-d electron-electron correlations. Squeezed phonon mode originates from the anharmonic character of the tetragonal Ni-B structure and is polarized in the vortical direction to the Ni layers. The isotope effect arises as a result of the zero point motion of the Ni-Ni d-electron hopping amplitude dominantly due to this vertical phonon mode. Within this model the isotope exponent is calculated to be αB ≤ 0.20 as compared to the recently found experimental value αexp B=0.27∓0.10. Finally, the phonon frequency softening predicted by our model eletron-phonon interaction is discussed within the context of recent experiments on the relevant boron A1g softening.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T10:43:03Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 1998en
dc.identifier.issn1300-0101
dc.identifier.urihttp://hdl.handle.net/11693/25333
dc.language.isoEnglishen_US
dc.source.titleTurkish Journal of Physicsen_US
dc.subjectBoron compoundsen_US
dc.subjectCalculationsen_US
dc.subjectElectronic structureen_US
dc.subjectElectronsen_US
dc.subjectIsotopesen_US
dc.subjectMathematical modelsen_US
dc.subjectNickelen_US
dc.subjectPhononsen_US
dc.subjectElectron phonon interactionen_US
dc.subjectIsotope effecten_US
dc.subjectPhonon softeningen_US
dc.subjectSuperconducting boronitridesen_US
dc.subjectSuperconducting materialsen_US
dc.titleIsotope Effect and Phonon Softening in Superconducting Borocarbides and Boronitridesen_US
dc.typeArticleen_US

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