title: Electron-phonon coupling in the conventional superconductor YNi2B2C at high phonon energies studied by time-of-flight neutron spectroscopy.
abstract: We report an inelastic neutron scattering investigation of phonons with energies up to 159 meV in the conventional superconductor YNi(2)B(2)C. Using the sweep mode, a newly developed time-of-flight technique involving the continuous rotation of a single crystal specimen, allowed us to measure a four-dimensional volume in (Q, E) space and, thus, determine the dispersion surface and linewidths of the A(1g) (≈102 meV) and A(u) (≈159 meV) type phonon modes over the whole Brillouin zone. Despite of having linewidths of Γ=10 meV, A(1g) modes do not strongly contribute to the total electron-phonon coupling constant λ. However, experimental linewidths show a remarkable agreement with ab initio calculations over the complete phonon energy range, demonstrating the accuracy of such calculations in a rare comparison to a comprehensive experimental data set.
authors.affiliation: Materials Science Division, Argonne National Laboratory, Illinois 60439, USA. frank.weber@kit.edu
authors.forename: F
authors.initials: F
authors.lastname: Weber
authors.forename: S
authors.initials: S
authors.lastname: Rosenkranz
authors.forename: L
authors.initials: L
authors.lastname: Pintschovius
authors.forename: J-P
authors.initials: JP
authors.lastname: Castellan
authors.forename: R
authors.initials: R
authors.lastname: Osborn
authors.forename: W
authors.initials: W
authors.lastname: Reichardt
authors.forename: R
authors.initials: R
authors.lastname: Heid
authors.forename: K-P
authors.initials: KP
authors.lastname: Bohnen
authors.forename: E A
authors.initials: EA
authors.lastname: Goremychkin
authors.forename: A
authors.initials: A
authors.lastname: Kreyssig
authors.forename: K
authors.initials: K
authors.lastname: Hradil
authors.forename: D L
authors.initials: DL
authors.lastname: Abernathy