Physics – Condensed Matter – Superconductivity
Scientific paper
2005-04-27
Physics
Condensed Matter
Superconductivity
PDF format; containing text and figures. accepted for publication in Journal of Physics Condensed Matter
Scientific paper
10.1088/0953-8984/17/21/021
Room temperature Raman scattering measurements have been carried out on well characterized samples of MgB2-xCx. The Raman line corresponding to the E2g phonon mode shows progressive hardening from 620 cm-1 in pristine MgB2 to 775 cm-1 in the sample with carbon fraction x=0.2. The corresponding line width on the other hand, increases from a value of about 220 cm-1 to 286 cm-1 in samples with x = 0.1, beyond which it decreases to a value 167 cm-1 for x=0.2. From the average mode frequency and the line width obtained from Raman measurements and taking the values of N(0) obtained from the calculated variation in s hole density of states in MgB2-xCx, the electron phonon coupling strength to the E2g phonon, l2g, is evaluated using Allen’s formula. This remains large for low C fraction, but shows rapid decrease for x > 0.10. Using this value of l2g appropriately weighted, TC is obtained from McMillan’s equation. These values are in good agreement with the experimentally measured TC variation in MgB2-xCx.
Bharathi A.
Deb Sudip K.
Gayathri N.
Hariharan Y.
Sakuntala T.
No associations
LandOfFree
Raman Scattering Investigation of Electron Phonon Coupling in Carbon substituted MgB2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Raman Scattering Investigation of Electron Phonon Coupling in Carbon substituted MgB2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Raman Scattering Investigation of Electron Phonon Coupling in Carbon substituted MgB2 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-612688