Dresden 2006 – scientific programme

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O: Oberflächenphysik

O 36: Structure and dynamics

O 36.2: Talk

Thursday, March 30, 2006, 11:30–11:45, WIL C207

Lattice dynamics of an iron monolayer — •Marcel Sladecek¹, A. Chumakov², P.T. Jochym³, J. Korecki^4,5, J. Lazewski³, K. Parlinski³, R. Röhlsberger⁶, R. Rüffer², B. Sepiol¹, T. Slezak^4,5, N. Spiridis⁵, S. Stankov^1,2, and G. Vogl¹ — ¹lnstitut für Materialphysik der Universität Wien, Wien, Austria — ²ESRF, F-38043 Grenoble, France — ³Department of Materials Research by Computers, Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland — ⁴Faculty of Physics and Nuclear Techniques, AGH University of Science and Technology, Cracow, Poland — ⁵Institute of Catalysis and Surface Chemistry, PAS, Cracow, Poland — ⁶HASYLAB at DESY, Hamburg, Germany

Nuclear resonant scattering (Mössbauer spectroscopy with synchrotron radiation) allows the direct observation of the phonon density of states (DOS). The resonant feature of the method enables the selective investigation of the dynamics of an iron layer deposited at the surface or at an interface. The results of a systematic investigation of iron layers with thicknesses in the range from 40 ML down to 1 ML deposited on a W(110) substrate are presented and compared with bulk DOS and ab-initio calculations. The observed spectra, which are the first DOS spectra of an uncoated iron monolayer, show a phonon softening due to the broken translational symmetry and an inplane anisotropy.

Supported by: Austrian ministry of science bm:bwk (GZ45.529/2-VI/B/7a/2002 No-dqMaterials Dynamics NetworkNo-dq) and European Community under the STREP Project Contract No. NMP4-CT-2003-001516 (DYNASYNC).