Strong Coupling of Rattling Phonon to Conduction Electrons in Semimetallic Type-I Clathrate Ba
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概要
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We report studies of <sup>117,119</sup>Sn and <sup>69,71</sup>Ga nuclear magnetic resonance (NMR) to investigate electron--phonon interactions due to the off-center rattling of Ba atoms in the semi-metallic type-I Ba<inf>8</inf>Ga<inf>16</inf>Sn<inf>30</inf>clathrate with n-type charge carriers in the temperature range of 0.4--200 K. The Ga NMR spin--lattice relaxation rate has an anomalous enhancement at approximately 10 K, indicating that the Ba atoms exhibit thermal rattling motion in an anharmonic potential. From calculations using a two-phonon Raman process model for a one-dimensional anharmonic Hamiltonian within a quasi-harmonic approximation, significant broadening of the phonon lifetime and softening of the phonon frequency are found to be essential to reproduce the temperature dependence of the NMR spin--lattice relaxation rate. The characteristic energy of the renormalized phonon frequency \omega_{\text{r}}\approx 21 K was obtained for the rattling state, in agreement with the values estimated by heat capacity analysis and other techniques. These results point to strong coupling of the rattling phonon to conduction electrons in semimetallic type-I Ba<inf>8</inf>Ga<inf>16</inf>Sn<inf>30</inf>.
- 2013-11-15
著者
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KOTEGAWA Hisashi
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Tou Hideki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Takabatake Toshiro
Department Of Quantum Matter Adsm Hiroshima University
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AVILA Marcos
CCNH, Univ. Federal do ABC
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Suekuni Koichiro
School Of Materials Science Japan Advanced Institute Of Science And Technology
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Tou Hideki
Department of Physics, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
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Sonoda Kanto
Department of Physics, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
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Furumoto Kazuya
Department of Physics, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
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