Electron-phonon coupling in the conventional superconductor YNi$_2$B$_2$C at high phonon energies studied by time-of-flight neutron spectroscopy

F. Weber; S. Rosenkranz; L. Pintschovius; J. -P. Castellan; R. Osborn; W. Reichardt; R. Heid; K. -P. Bohnen; E. A. Goremychkin; A. Kreyssig; K. Hradil; D. L. Abernathy

doi:10.1103/PhysRevLett.109.057001

paper

Electron-phonon coupling in the conventional superconductor YNi $_{2}$ B $_{2}$ C at high phonon energies studied by time-of-flight neutron spectroscopy

arXiv:1207.0607 · doi:10.1103/PhysRevLett.109.057001

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 $A_{1 g}$ (~ 102 meV) and $A_{u}$ (~ 159 meV) type phonon modes for the whole Brillouin zone. Despite of having linewidths of $Γ = 10 m e V$ , $A_{1 g}$ 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.

accepted for publication in PRL

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Is LaO $_{1 - x}$ F $_{x}$ FeAs an electron-phonon superconductor ?

Electron-phonon coupling in the conventional superconductor YNi2​B2​C at high phonon energies studied by time-of-flight neutron spectroscopy

Abstract

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Electron-phonon coupling in the conventional superconductor YNi $_{2}$ B $_{2}$ C at high phonon energies studied by time-of-flight neutron spectroscopy