Electron-Phonon Coupling in the Conventional Superconductor YNi2B2C 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, and D. L. Abernathy
Phys. Rev. Lett. 109, 057001 – Published 31 July 2012
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Abstract

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 (102meV) and Au (159meV) type phonon modes over the whole Brillouin zone. Despite of having linewidths of Γ=10meV, 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.

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  • Received 21 November 2011

DOI:https://doi.org/10.1103/PhysRevLett.109.057001

© 2012 American Physical Society

Authors & Affiliations

F. Weber1,2,*, S. Rosenkranz1, L. Pintschovius2, J.-P. Castellan1, R. Osborn1, W. Reichardt2, R. Heid2, K.-P. Bohnen2, E. A. Goremychkin1, A. Kreyssig3,†, K. Hradil4,‡, and D. L. Abernathy5

  • 1Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 2Institute of Solid State Physics, Karlsruhe Institute of Technology, P.O. Box 3640, D-76021 Karlsruhe, Germany
  • 3Technische Universität Dresden, Institut für Festkörperphysik, D-01062 Dresden, Germany
  • 4Universität Göttingen, Institut für physikalische Chemie, Außenstelle FRM-II, D-85747 Garching, Germany
  • 5Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *frank.weber@kit.edu
  • Present address: Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA.
  • Present address: Röntgenzentrum, TU Wien, Wien, 1060, Austria.

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Vol. 109, Iss. 5 — 3 August 2012

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