Title: Glasslike excitations in single crystalline Sr8Ga16Ge30 clathrates
Authors: Keppens, V
McGuire, MA
Teklu, A
Laermans, Christiane
Sales, BC
Mandrus, D
Chakoumakos, BC #
Issue Date: May-2002
Publisher: Elsevier science bv
Series Title: Physica b-condensed matter vol:316 pages:95-100
Abstract: Low-temperature ultrasonic attenuation and resonant ultrasound spectroscopy (RUS) data are reported on single crystals of the semiconductor Sr8Ga16Ge30. The attenuation shows a strikingly glasslike behavior, implying that the elastic properties of the clathrate crystal at low temperatures (T < 1 K) are dominated by the presence of tunneling states. At slightly higher temperatures, the RUS data reflect the presence of a 2-level system with an energy-spacing of 45 K. The origin of these low-energy excitations is found in the 'rattling' Sr-atom, which occupies a fourfold split site in the clathrate structure. (C) 2002 Elsevier Science B.V. All rights reserved.
ISSN: 0921-4526
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Semiconductor Physics Section
# (joint) last author

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