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Struktur und Dynamik Poster: Mi., 14:00–16:30 M-P165 Opening of the SC Gap observed in Neutron Spectroscopy Frank Weber 1,2 , Rolf Heid 1 , Andreas Kreyssig 3 , Lothar Pintschovius 1 , Dmitry Reznik 1,4 , Wilfried Reichardt 1 , Oliver Stockert 5 , Klaudia Hradil 6 1 Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany – 2 Physikalisches Institut, Universität Karlsruhe (TH), D-76128 Karlsruhe, Germany – 3 Institut für Festkörperphysik, TU Dresden, D-01062 Dresden, Germany (present adress: Ames Laboratory, USA) – 4 Laboratoire Léon Brillouin, C.E. Saclay, F-99191 Gif-sur-Yvette, France – 5 Max-Planck-Institut für Chem. Physik fester Stoffe, D-01187 Dresden, Germany – 6 Institut für phys. Chemie, Universität Göttingen, Aussenstelle FRM II, D-85747 Garching, Germany It was previously noted that acoustic phonons in YNi2B2C [1] and LuNi2B2C [2] with wavevectors q ≈ (0.5,0,0) undergo strong changes of their lineshapes upon entering the superconducting (SC) state. However, no convincing interpretation of the data could be given. Here, we present inelastic neutron scattering data on YNi2B2C (Tc = 15 K). We made a systematic study of the already known phonon anomaly in the (100)-direction as well as of a so far unexplored anomaly at the zone boundary in the (110)-direction (Mpoint). Our data unambiguously show that the superconductivity-induced changes of the spectral function of phonons with a strong electron-phonon coupling can extremely well be understood in the framework of a theory proposed by Allen et al. [3]. The analysis yields the temperature dependent SC energy gap with high accuracy. As a consequence, even deviations from BCS like behavior can be assessed with confidence. Further, we found that the Sc gap extracted from the phonon data for q=(0.5,0,0) and q=(0.5,0.5,0), respectively, differs by a factor 1.4. This is a direct proof for the long discussed anisotropy of the SC energy gap in borocarbides (e.g., Ref. [4]). A prerequisite for the observation of the gap anisotropy is to select phonons for which the dominant coupling to the quasiparticles stems from a relatively small part of the Fermi surface. Our choice was guided by DFT calculations [5] which predict both the phonon frequencies and linewidths very well. [1] Kawano et al., PRL. 77, 4628 (1996), [2] Stassis et al., PRB 55, R8678 (1997), [3] Allen et al., PRB 56, 5552 (1997), [4] Izawa et al., PRL 89, 137006 (2002), [5] Reichardt et al., J. Superconductivity, 10.1007 (2005)
Struktur und Dynamik Poster: Mi., 14:00–16:30 M-P166 Statistical model of radiation damage within an atomic cluster irradiated by VUV photons from FEL. Beata Ziaja-Motyka 1 , A. R. B. de Castro 1 , Edgar Weckert 1 , Thomas Möller 1 1 HASYLAB, DESY, Notkestrasse 85, 22607 Hamburg Boltzmann equations are applied for modelling the radiation damage in samples irradiated by photons emitted from free electron laser (FEL). This statistical approach is used to model the evolution of a spherically symmetric xenon cluster consisting of 1000 atoms irradiated with FEL photons at VUV energies. Simulation parameters follow those set in the first cluster experiments performed at FLASH at DESY HAMBURG. Predictions obtained with this theoretical model are then compared to the experimental data. The results obtained demonstrate the potential of the Boltzmann method for describing the complex and non-equilibrium dynamics of samples exposed to FEL radiation. In particular, this approach work also well for large samples, for which the standard simulation methods become inefficient.
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Postersitzung A Mittwoch, 4. Oktobe
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Postersitzung B Donnerstag, 5. Okto
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Index Autoren und ihre Beiträge: u
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Index M-P98, M-P100, M-P101, M-P195
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Index Deák, L. D-P300 Decker, H. M
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Index Gavrila, G. D-P276 Gebhardt,
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Index Homeyer, J. D-P377, D-P389 Ho
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Index Kravtsov, E. D-P231, D-P252 K
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Index Mezei, F. M-P13, M-P22, D-V27
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Index Ponce, M.L. D-P214 Ponkratz,
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Index Schmidt, O. M-P132, M-P153 Sc
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Index Stürmer, D. D-P405 Stuermer,
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Index Wochner, P. F-V68 Woiterski,
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