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Micro-Raman scattering investigation of MgB2 and RB2 (R=Al, Mn, Nb and Ti)

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arxiv cond-mat/0106147 v1 pith:CPY2IC4R submitted 2001-06-08 cond-mat.supr-con

Micro-Raman scattering investigation of MgB2 and RB2 (R=Al, Mn, Nb and Ti)

N. Ogita , T. Kariya , K. Hiraoka , J. Nagamatsu , T. Muranaka , H. Takagiwa , J. Akimitsu , M. Udagawa This is my paper
classification cond-mat.supr-con
keywords mgb2beenmicro-ramanpeaksphononscatteringspectraanhamonicity
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Phonon spectra have been investigated by micro-Raman scattering from 290 to 20K. New peaks at 500 and 674 cm-1 appear below 250K in MgB2. These peaks are explained by the Fermi resonance, where Raman-active E2g intereacts with the overtone of E1u due to anhamonicity. Raman spectra of the isostructural RB2 (R=Al, Mn, Nb and Ti) have been also measured at 290K. The line width of E2g phonon of the superconductor MgB2 and NbB2 shows the broader than that of the non-superconductors. It is found that the anharmonicity of phonons is important for the superconductivity for MgB2.

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