Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 3: CE: Charge Density Wave \& Peierls Instability
TT 3.5: Vortrag
Montag, 14. März 2011, 11:45–12:00, HSZ 304
Extended Phonon Collapse in the Charge-Density-Wave Compound NbSe2 — •Frank Weber1,2, Stephan Rosenkranz2, John-Paul Castellan2, Raymond Osborn2, Roland Hott1, Rolf Heid1, Klaus-Peter Bohnen1, Takeshi Egami3, Ayman Said4, and Dmitry Reznik1,5 — 1Karlsruhe Institute of Technology, Institute of Solid State Physics, P. O. Box 3640, D-76021 Karlsruhe, Germany — 2Materials Science Division, Argonne National Laboratory, Argonne, Illinois, 60439, USA — 3Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee, 37996, USA — 4Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, 60439, USA — 5Department of Physics, University of Colorado at Boulder, Boulder, Colorado, 80309, USA
We investigated the phonon softening in the charge density wave compound NbSe2 using the high-resolution hard inelastic x-ray scattering beamline 30-ID-C at the Advanced Photon Source, Argonne National Laboratory. The acoustic Σ1 phonon branch was measured from the zone center Γ to the M point at temperatures between 250 K and 8 K across the CDW transition at TCDW = 33 K. Density functional theory calculations for the lattice dynamical properties which predict an extended phonon breakdown are used to analyze the detailed nature of the softening phonon branch. Work supported by US DOE BES-DMS DE-AC02-06CH11357.