TY - JOUR
T1 - Emergence of elastic softening in Sr8Ga16Si 30-xGex with increasing Ge concentration
AU - Suzuki, Takashi
AU - Okada, Chika
AU - Suetomi, Yasuhiko
AU - Fujita, Takahiro K.
AU - Ishii, Isao
AU - Suekuni, Koichiro
AU - Avila, Marcos A.
AU - Takabatake, Toshiro
PY - 2011/7
Y1 - 2011/7
N2 - 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.
AB - 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.
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U2 - 10.1143/JPSJS.80SA.SA038
DO - 10.1143/JPSJS.80SA.SA038
M3 - Article
AN - SCOPUS:80052397502
SN - 0031-9015
VL - 80
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - SUPPL. A
M1 - SA038
ER -