Phonons in Iron: From the Bulk to an Epitaxial Monolayer

作     者：S. Stankov R. Röhlsberger T. Ślęzak M. Sladecek B. Sepiol G. Vogl A. I. Chumakov R. Rüffer N. Spiridis J. Łażewski K. Parliński J. Korecki 

作者机构：European Synchrotron Radiation Facility B.P. 220 38043 Grenoble Cedex France Institut für Materialphysik der Universität Wien Wien Austria Deutsches Elektronen Synchrotron DESY Notkestr. 85 22607 Hamburg Germany Institute of Catalysis and Surface Chemistry Polish Academy of Sciences Cracow Poland Faculty of Physics and Applied Computer Science AGH University of Science and Technology Cracow Poland Institute of Nuclear Physics Polish Academy of Sciences Cracow Poland Institute of Technics Pedagogical University Cracow Poland 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2007年第99卷第18期

页      面：185501-185501页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Epitaxial layers 

摘      要：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.