Phonons in iron: from the bulk to an epitaxial monolayer.
作者： S. Stankov , R. Röhlsberger , T. Ślęzak , M. Sladecek , B. Sepiol
DOI: 10.1103/PHYSREVLETT.99.185501
关键词: Epitaxy 、 Molecular physics 、 Molecular vibration 、 Infrared spectroscopy 、 Atomic displacement 、 Monolayer 、 Phonon 、 Materials science 、 Vibration 、 Atomic physics
摘要: The confinement of materials in low-dimensional structures has significant impact on propagating excitations like phonons. Using the isotope-specific 57 Fe nuclear resonant vibrational spectroscopy we were able to determine elastic and thermodynamic properties ultrathin films W(110). With decreasing thickness one observes a increase mean atomic displacement that goes along with an enhancement modes at low energies as compared bulk. analysis reveals these deviations result from vibrations single layers two boundaries film, while atoms inside vibrate almost bulklike.
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