Unusual quasiparticle renormalizations from angle resolved photoemission on USb2
| Title | Unusual quasiparticle renormalizations from angle resolved photoemission on USb2 |
| Publication Type | Journal Article |
| Year of Publication | 2009 |
| Authors | Yang X, Riseborough PS, Durakiewicz T, Olson CG, Joyce JJ, Bauer ED, Sarrao JL, Moore DP, Graham KS, Elgazzar S, Oppeneer PM, Guziewicz E, Butterfield MT |
| Journal Title | Philosophical Magazine |
| Volume | 89 |
| Pages | 1893-1911 |
| ISBN Number | 1478-6435 |
| Accession Number | ISI:000268606800014 |
| Keywords | accurate, angle resolved photoemission, crystal-growth, cylindrical fermi surfaces, dispersion, electron-phonon interaction, ferromagnetism, mass enhancements, quasiparticles, spin fluctuations, superconductivity, upt3, usb2 |
| Abstract | Angle-resolved photoemission experiments have been performed on USb2, and very narrow quasiparticle peaks have been observed in a band, which local spin-density approximation (LSDA) predicts to osculate the Fermi energy. The observed band is found to be depressed by 17 meV below the Fermi energy. Furthermore, the inferred quasiparticle dispersion relation for this band exhibits a kink at an energy of about 23 meV below the Fermi energy. The kink is not found in LSDA calculations and, therefore, is attributable to a change in the quasiparticle mass renormalization by a factor of approximately 2. The existence of a kink in the quasiparticle dispersion relation of a band that does not cross the Fermi energy is unprecedented. The kink in the quasiparticle dispersion relation is attributed to the effect of the interband self-energy, involving transitions from the osculating band into a band that does cross the Fermi energy. |
| URL | <Go to ISI>://000268606800014 |
| DOI | 10.1080/14786430802629501 |
