Phonons in Iron: From the Bulk to an Epitaxial Monolayer

Autor(en)

Svetoslav Stankov, Ralf Röhlsberger, Tomasz Slezak, Marcel Sladecek, Bogdan Sepiol, Gero Vogl, A Chumakov, Rudolf Rüffer, Nika Spiridis, J Lazewski, K Parlinski, Jozef Korecki

Abstrakt

The confinement of materials in low-dimensional structures has significant impact on propagating

excitations like phonons. Using the isotope-specific 57Fe 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.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

European Synchrotron Radiation Facility ESRF, Hamburger Synchrotronstahlungslabor HASYLAB , AGH University of Science and Technology, Polish Academy of Sciences (PAS)

Journal

Physical Review Letters

Band

99

Anzahl der Seiten

4

ISSN

0031-9007

DOI

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

Publikationsdatum

2007

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/phonons-in-iron-from-the-bulk-to-an-epitaxial-monolayer(6745459e-7789-43da-9493-58eb85b343bb).html