PMID: 12785920Jun 6, 2003Paper

c-Axis Raman scattering spectra of MgB2: observation of a dirty-limit gap in the pi bands

Physical Review Letters
J W QuiltyA Yamanaka

Abstract

Raman scattering spectra from the ac face of thick MgB2 single crystals were measured in zz, xz, and xx polarizations. In zz and xz polarizations a threshold at around 29 cm(-1) forms in the below T(c) continuum but no pair-breaking peak is seen, in contrast to the sharp pair-breaking peak at around 100 cm(-1) in xx polarization. The zz and xz spectra are consistent with Raman scattering from a dirty superconductor while the sharp peak in the xx spectra argues for a clean system. Analysis of the spectra resolves this contradiction, placing the larger and smaller gap magnitudes in the sigma and pi bands and indicating that relatively strong impurity scattering is restricted to the pi bands.

References

Nov 1, 1996·Physical Review. B, Condensed Matter·T P DevereauxA Zawadowski
Jun 1, 1992·Physical Review. B, Condensed Matter·T P Devereaux
May 1, 2001·Physical Review Letters·J M An, W E Pickett
Jun 1, 2001·Physical Review Letters·J KortusL L Boyer
Jun 21, 2001·Physical Review Letters·O F de LimaA A Coelho
Oct 3, 2001·Physical Review Letters·X K ChenJ P Franck
Apr 17, 2002·Physical Review Letters·H UchiyamaS Tajima
Jun 13, 2002·Physical Review Letters·E A YellandS Tajima
Aug 16, 2002·Nature·Hyoung Joon ChoiSteven G Louie
Sep 13, 2002·Physical Review Letters·I I MazinD Van Der Marel

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Citations

May 2, 2003·Nature·S SoumaK Kadowaki
Jun 20, 2007·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Min-Seok ParkSung-Ik Lee
Aug 16, 2006·Physical Review Letters·T KakeshitaS Tajima

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