Extreme lowering of the Debye temperature of Sn nanoclusters embedded in thermally grown $\mathrm{Si}{\mathrm{O}}_{2}$ by low-lying vibrational surface modes

Extreme lowering of the Debye temperature of Sn nanoclusters embedded in thermally grown $Si O_{2}$ by low-lying vibrational surface modes

G. E. J. Koops, H. Pattyn, A. Vantomme, S. Nauwelaerts, and R. Venegas

Phys. Rev. B 70, 235410 – Published 8 December 2004

Abstract

The formation and dynamical behavior of Sn clusters embedded in amorphous, thermally grown $Si O_{2}$ layers, formed by ion implantation, is monitored through ${}^{119}{Sn}$ Mössbauer spectroscopy. We observe an extreme decrease of the cluster Debye temperature $θ_{D}$ for samples annealed at $800 ° C$ in a reducing atmosphere. We show with a model, based on classical elasticity theory, that this lowering can be explained by a decrease of the surface vibrational modes when a Sn microcrystal is embedded in a $Si O_{2}$ matrix.

Received 15 December 2003

DOI:https://doi.org/10.1103/PhysRevB.70.235410

Authors & Affiliations

G. E. J. Koops^*, H. Pattyn, A. Vantomme, S. Nauwelaerts, and R. Venegas^†

Instituut voor Kern- en Stralingsfysica, Physics Department, K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium

^*Present address: Philips Research Leuven, Kapeldreef 75 (D1), B-3001, Leuven, Belgium; Email address: gerhard.koops@philips.com
^†Work performed while on leave from University of Santiago, Chile.

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Vol. 70, Iss. 23 — 15 December 2004

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Physical Review B

covering condensed matter and materials physics

Extreme lowering of the Debye temperature of Sn nanoclusters embedded in thermally grown $Si O_{2}$ by low-lying vibrational surface modes

G. E. J. Koops, H. Pattyn, A. Vantomme, S. Nauwelaerts, and R. Venegas

Phys. Rev. B 70, 235410 – Published 8 December 2004

Abstract

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Physical Review B

covering condensed matter and materials physics

Extreme lowering of the Debye temperature of Sn nanoclusters embedded in thermally grown SiO2 by low-lying vibrational surface modes

G. E. J. Koops, H. Pattyn, A. Vantomme, S. Nauwelaerts, and R. Venegas

Phys. Rev. B 70, 235410 – Published 8 December 2004

Abstract

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Extreme lowering of the Debye temperature of Sn nanoclusters embedded in thermally grown $Si O_{2}$ by low-lying vibrational surface modes