skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Lattice dynamics in Sn nanoislands and cluster-assembled films

Abstract

To unravel the effects of phonon confinement, the influence of size and morphology on the atomic vibrations is investigated in Sn nanoislands and cluster-assembled films. Nuclear resonant inelastic x-ray scattering is used to probe the phonon densities of states of the Sn nanostructures which show significant broadening of the features compared to bulk phonon behavior. Supported by ab initio calculations, the broadening is attributed to phonon scattering and can be described within the damped harmonic oscillator model. Contrary to the expectations based on previous research, the appearance of high-energy modes above the cutoff energy is not observed. From the thermodynamic properties extracted from the phonon densities of states, it was found that grain boundary Sn atoms are bound by weaker forces than bulk Sn atoms.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division
OSTI Identifier:
1377394
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 95; Journal Issue: 15
Country of Publication:
United States
Language:
English
Subject:
Lattice dynamics

Citation Formats

Houben, Kelly, Couet, Sebastien, Trekels, Maarten, Menéndez, Enric, Peissker, Tobias, Seo, Jin Won, Hu, Michael Y., Zhao, Jiyong Y., Alp, Esen E., Roelants, Sam, Partoens, Bart, Milošević, Milorad V., Peeters, François M., Bessas, Dimitrios, Brown, Simon A., Vantomme, André, Temst, Kristiaan, and Van Bael, Margriet J. Lattice dynamics in Sn nanoislands and cluster-assembled films. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.155413.
Houben, Kelly, Couet, Sebastien, Trekels, Maarten, Menéndez, Enric, Peissker, Tobias, Seo, Jin Won, Hu, Michael Y., Zhao, Jiyong Y., Alp, Esen E., Roelants, Sam, Partoens, Bart, Milošević, Milorad V., Peeters, François M., Bessas, Dimitrios, Brown, Simon A., Vantomme, André, Temst, Kristiaan, & Van Bael, Margriet J. Lattice dynamics in Sn nanoislands and cluster-assembled films. United States. doi:10.1103/PhysRevB.95.155413.
Houben, Kelly, Couet, Sebastien, Trekels, Maarten, Menéndez, Enric, Peissker, Tobias, Seo, Jin Won, Hu, Michael Y., Zhao, Jiyong Y., Alp, Esen E., Roelants, Sam, Partoens, Bart, Milošević, Milorad V., Peeters, François M., Bessas, Dimitrios, Brown, Simon A., Vantomme, André, Temst, Kristiaan, and Van Bael, Margriet J. Sat . "Lattice dynamics in Sn nanoislands and cluster-assembled films". United States. doi:10.1103/PhysRevB.95.155413.
@article{osti_1377394,
title = {Lattice dynamics in Sn nanoislands and cluster-assembled films},
author = {Houben, Kelly and Couet, Sebastien and Trekels, Maarten and Menéndez, Enric and Peissker, Tobias and Seo, Jin Won and Hu, Michael Y. and Zhao, Jiyong Y. and Alp, Esen E. and Roelants, Sam and Partoens, Bart and Milošević, Milorad V. and Peeters, François M. and Bessas, Dimitrios and Brown, Simon A. and Vantomme, André and Temst, Kristiaan and Van Bael, Margriet J.},
abstractNote = {To unravel the effects of phonon confinement, the influence of size and morphology on the atomic vibrations is investigated in Sn nanoislands and cluster-assembled films. Nuclear resonant inelastic x-ray scattering is used to probe the phonon densities of states of the Sn nanostructures which show significant broadening of the features compared to bulk phonon behavior. Supported by ab initio calculations, the broadening is attributed to phonon scattering and can be described within the damped harmonic oscillator model. Contrary to the expectations based on previous research, the appearance of high-energy modes above the cutoff energy is not observed. From the thermodynamic properties extracted from the phonon densities of states, it was found that grain boundary Sn atoms are bound by weaker forces than bulk Sn atoms.},
doi = {10.1103/PhysRevB.95.155413},
journal = {Physical Review B},
number = 15,
volume = 95,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}
  • Sn{sub 1-x}/Si{sub x} cluster assembled films have been prepared by an energetic cluster impact deposition using a plasma-gas-condensation cluster beam deposition apparatus. Transmission electron microscope images indicated that individual clusters have composite morphologies, where Sn and Si were separated from each other. The superconducting critical magnetic fields, H{sub c}, of Sn{sub 1-x}/Si{sub x} cluster assembled films were measured and found to be much higher than the critical magnetic field of the bulk Sn. We estimated the H{sub c} values by using a theory of the superconducting thin film. The estimated values are in good agreement with the experiments, indicating thatmore » the Sn{sub 1-x}/Si{sub x} cluster assembled films can be regarded as a two-dimensional system although thickness, t, of Sn{sub 1-x}/Si{sub x} cluster assembled films (t Almost-Equal-To 1000 nm) is thicker than conventional superconducting thin film (t < 100 nm).« less
  • Cited by 2
  • High-density Fe cluster-assembled films were produced at room temperature by an energetic cluster deposition. Though cluster-assemblies are usually sooty and porous, the present Fe cluster-assembled films are lustrous and dense, revealing a soft magnetic behavior. Size-monodispersed Fe clusters with the mean cluster size d=9 nm were synthesized using a plasma-gas-condensation technique. Ionized clusters are accelerated electrically and deposited onto the substrate together with neutral clusters from the same cluster source. Packing fraction and saturation magnetic flux density increase rapidly and magnetic coercivity decreases remarkably with increasing acceleration voltage. The Fe cluster-assembled film obtained at the acceleration voltage of -20 kVmore » has a packing fraction of 0.86{+-}0.03, saturation magnetic flux density of 1.78{+-}0.05 Wb/m{sup 2}, and coercivity value smaller than 80 A/m. The resistivity at room temperature is ten times larger than that of bulk Fe metal.« less