Phonons in Iron: From the Bulk to an Epitaxial Monolayer

S. Stankov, R. Röhlsberger, T. Ślęzak, M. Sladecek, B. Sepiol, G. Vogl, A. I. Chumakov, R. Rüffer, N. Spiridis, J. Łażewski, K. Parliński, and J. Korecki
Phys. Rev. Lett. 99, 185501 – Published 30 October 2007

Abstract

The confinement of materials in low-dimensional structures has significant impact on propagating excitations like phonons. Using the isotope-specific Fe57 nuclear resonant vibrational spectroscopy we were able to determine elastic and thermodynamic properties of ultrathin Fe films on W(110). With decreasing thickness one observes a significant increase of the mean atomic displacement that goes along with an enhancement of vibrational modes at low energies as compared to the bulk. The analysis reveals that these deviations result from atomic vibrations of the single atomic layers at the two boundaries of the film, while the atoms inside the films vibrate almost bulklike.

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  • Received 4 June 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.185501

©2007 American Physical Society

Authors & Affiliations

S. Stankov1,2, R. Röhlsberger3,*, T. Ślęzak4,5, M. Sladecek2, B. Sepiol2, G. Vogl2, A. I. Chumakov1, R. Rüffer1, N. Spiridis4, J. Łażewski6, K. Parliński6,7, and J. Korecki4,5

  • 1European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble Cedex, France
  • 2Institut für Materialphysik der Universität Wien, Wien, Austria
  • 3Deutsches Elektronen Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
  • 4Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Cracow, Poland
  • 5Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Cracow, Poland
  • 6Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
  • 7Institute of Technics, Pedagogical University, Cracow, Poland

  • *Author to whom correspondence should be addressed. ralf.roehlsberger@desy.de

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Vol. 99, Iss. 18 — 2 November 2007

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