Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 12: Poster Session Superconductivity
TT 12.57: Poster
Montag, 11. März 2013, 15:00–19:00, Poster D
Phonon line shapes in the vortex state of the phonon-mediated superconductor YNi2B2C — •Frank Weber1, Lothar Pintschovius1, Klaudia Hradil2, and Daniel Petitgrand3 — 1Institut für Festkörperphysik, Karlsruher Institut für Technologie, Karlsruhe, Germany — 2Institut für Physikalische Chemie, Universität Göttingen, Außenstelle FRM-II, Garching, Germany — 3Laboratoire Léon Brillouin (CEA-CNRS), CEA-Saclay, Gif-sur-Yvette, France
We present an inelastic neutron-scattering study of phonon line shapes in the vortex state of the type II
superconductor YNi2B2C. In a previous study [1] we showed that certain phonons exhibit a clear signature of the superconducting gap 2Δ on entering the superconducting state. Our interest was to find out whether or not the line shape of such phonons reflects the inhomogeneous nature of the vortex state induced by a magnetic field smaller than the upper critical field Bc2.We found that this is indeed the case because the observed phonon line shapes can be well described by a model considering the phonon as a local
probe of the spatial variation of the superconducting gap.
[1] F. Weber, A. Kreyssig, L. Pintschovius, R. Heid, W. Reichardt, D. Reznik, O. Stockert, and K. Hradil, Phys. Rev. Lett. 101, 237002 (2008)