Emergence of elastic softening in Sr8Ga16Si 30-xGex with increasing Ge concentration

Takashi Suzuki, Chika Okada, Yasuhiko Suetomi, Takahiro K. Fujita, Isao Ishii, Koichiro Suekuni, Marcos A. Avila, Toshiro Takabatake

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Abstract

We have carried out an ultrasonic spectroscopy for the single crystals of Sr8Ga16Si30-xGex with x = 0, 15, 20, 24, and 30 in order to investigate cage-size dependence of elastic moduli. We present here the temperature dependence of transverse modulus C44 at various ultrasonic frequencies measured by using a pulse-echo type phase comparison technique. The C44 mode of the sample with x = 30 shows remarkable elastic softening below 100 K. In contrast, no softening is detected in the C44 mode of the samples with x = 0 and 15. We found clear correlation between the off-center motion of guest atoms and the elastic softening.

Original languageEnglish
Article numberSA038
Journaljournal of the physical society of japan
Volume80
Issue numberSUPPL. A
DOIs
Publication statusPublished - Jul 1 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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