TY - JOUR
T1 - Electron-phonon coupling in the conventional superconductor YNi 2B 2C at high phonon energies studied by time-of-flight neutron spectroscopy
AU - Weber, F.
AU - Rosenkranz, S.
AU - Pintschovius, L.
AU - Castellan, J. P.
AU - Osborn, R.
AU - Reichardt, W.
AU - Heid, R.
AU - Bohnen, K. P.
AU - Goremychkin, E. A.
AU - Kreyssig, A.
AU - Hradil, K.
AU - Abernathy, D. L.
PY - 2012/7/31
Y1 - 2012/7/31
N2 - We report an inelastic neutron scattering investigation of phonons with energies up to 159meV in the conventional superconductor YNi 2B 2C. 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 (102meV) and A u (159meV) type phonon modes over the whole Brillouin zone. Despite of having linewidths of Γ=10meV, A 1g modes do not strongly contribute to the total electron-phonon coupling constant λ. However, experimental linewidths show a remarkable agreement with abinitio calculations over the complete phonon energy range, demonstrating the accuracy of such calculations in a rare comparison to a comprehensive experimental data set.
AB - We report an inelastic neutron scattering investigation of phonons with energies up to 159meV in the conventional superconductor YNi 2B 2C. 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 (102meV) and A u (159meV) type phonon modes over the whole Brillouin zone. Despite of having linewidths of Γ=10meV, A 1g modes do not strongly contribute to the total electron-phonon coupling constant λ. However, experimental linewidths show a remarkable agreement with abinitio calculations over the complete phonon energy range, demonstrating the accuracy of such calculations in a rare comparison to a comprehensive experimental data set.
UR - http://www.scopus.com/inward/record.url?scp=84864443076&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.109.057001
DO - 10.1103/PhysRevLett.109.057001
M3 - Article
AN - SCOPUS:84864443076
SN - 0031-9007
VL - 109
JO - Physical Review Letters
JF - Physical Review Letters
IS - 5
M1 - 057001
ER -