Zeitschriftenartikel:
F. Weber, S. Rosenkranz, L. Pintschovius, J. Castellan, R. Osborn, W. Reichardt, R. Heid, K. Bohnen, E. Goremychkin, A. Kreyssig, K. Hradil, D. Albernathy:
"Electron-phonon coupling in the conventional superconductor YNi2B2C up to very high phonon energies studied by time-of-flight neutron spectroscopy";
Physical Review Letters,
109
(2012),
5;
S. 057001-1
- 057001-5.
Kurzfassung englisch:
We report an inelastic neutron scattering investigation of phonons with energies up to 159 meV in the conventional superconductor YNi2B2C. 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 A1g (≈102 meV) and Au (≈159 meV) type phonon modes over the whole Brillouin zone. Despite of having linewidths of Γ=10 meV, A1g 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.
Schlagworte:
Electron-phonon coupling; time-of-flight spectroscopy;superconductor
"Offizielle" elektronische Version der Publikation (entsprechend ihrem Digital Object Identifier - DOI)
http://dx.doi.org/10.1103/PhysRevLett.109.057001
Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.