Raman spectroscopic study of carbon substitution in MgB2

J. Arvanitidis, K. Papagelis, K. Prassides, G. A. Kourouklis, S. Ves, T. Takenobu, Y. Iwasa

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We study the effect of carbon doping on the Raman spectrum of the MgB 2 superconductor. Out data show that significant changes in the Raman spectra of the MgB2-xCx compounds occur for carbon concentrations x>0.04. The E2g mode at ∼580 cm-1 hardens only moderately upon increased doping despite direct carbon substitution in the boron layers, while the dependence of its full width at half maximum (FWHM) on x reveals the competing effects of reduced electron-phonon coupling and increased disorder. The results are discussed in the framework of anisotropic lattice contraction and the position of the σ sub-bands with respect to the Fermi energy level. The relative intensity of the phonon peak at ∼770 cm-1, associated with a peak in the phonon density of states, increases considerably and dominates for x = 0.08. Additionally, it hardens and broadens with increasing x in the range 0.04-0.08. These changes can be associated with carbon substitution-induced disorder in the investigated samples.

Original languageEnglish
Pages (from-to)73-77
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume65
Issue number1
DOIs
Publication statusPublished - 2004 Jan
Externally publishedYes

Fingerprint

Substitution reactions
Carbon
substitutes
carbon
Raman scattering
Doping (additives)
disorders
Raman spectra
Boron
Full width at half maximum
Fermi level
Electron energy levels
Superconducting materials
contraction
boron
energy levels
Electrons
electrons

Keywords

  • C. Raman Spectroscopy
  • C. X-ray diffraction
  • D. Fermi surface
  • D. Phonons
  • D. Superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Arvanitidis, J., Papagelis, K., Prassides, K., Kourouklis, G. A., Ves, S., Takenobu, T., & Iwasa, Y. (2004). Raman spectroscopic study of carbon substitution in MgB2 Journal of Physics and Chemistry of Solids, 65(1), 73-77. https://doi.org/10.1016/j.jpcs.2003.08.010

Raman spectroscopic study of carbon substitution in MgB2 . / Arvanitidis, J.; Papagelis, K.; Prassides, K.; Kourouklis, G. A.; Ves, S.; Takenobu, T.; Iwasa, Y.

In: Journal of Physics and Chemistry of Solids, Vol. 65, No. 1, 01.2004, p. 73-77.

Research output: Contribution to journalArticle

Arvanitidis, J, Papagelis, K, Prassides, K, Kourouklis, GA, Ves, S, Takenobu, T & Iwasa, Y 2004, 'Raman spectroscopic study of carbon substitution in MgB2 ', Journal of Physics and Chemistry of Solids, vol. 65, no. 1, pp. 73-77. https://doi.org/10.1016/j.jpcs.2003.08.010
Arvanitidis J, Papagelis K, Prassides K, Kourouklis GA, Ves S, Takenobu T et al. Raman spectroscopic study of carbon substitution in MgB2 Journal of Physics and Chemistry of Solids. 2004 Jan;65(1):73-77. https://doi.org/10.1016/j.jpcs.2003.08.010
Arvanitidis, J. ; Papagelis, K. ; Prassides, K. ; Kourouklis, G. A. ; Ves, S. ; Takenobu, T. ; Iwasa, Y. / Raman spectroscopic study of carbon substitution in MgB2 In: Journal of Physics and Chemistry of Solids. 2004 ; Vol. 65, No. 1. pp. 73-77.
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