• Published 2001

J un 2 00 1 Micro-Raman scattering investigation of MgB 2 and RB 2 ( R = Al , Mn , Nb and Ti )

@inproceedings{Ogita2001JU2,
  title={J un 2 00 1 Micro-Raman scattering investigation of MgB 2 and RB 2 ( R = Al , Mn , Nb and Ti )},
  author={Norio Ogita and Tsuyoshi Kariya and Katsuhiro Hiraoka and Jun Nagamatsu and Takahiro Muranaka and H. Takagiwa and Jun Akimitsu and Masayuki Udagawa},
  year={2001}
}
Phonon spectra have been investigated by micro-Raman scattering from 290 to 20K. New peaks at 500 and 674 cm 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 nonsuperconductors. It is found that… CONTINUE READING

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Raman scattering spectrum from black grain(a), blue(b) and gold(c) measured by the micro-Raman spectra with the ×50 objective at 290K. The (c) is the Raman scattering spectrum of MgB2

S. Sakita
  • Phys. Rev. 63,
  • 2001