NMR relaxation and rattling phonons in the type-I Ba8Ga16Sn30clathrate Academic Article uri icon

abstract

  • Atomic motion of guest atoms inside semiconducting clathrate cages is considered an important source for glasslike thermal behavior. 69Ga and 71Ga nuclear magnetic resonance studies on type I Ba8Ga 16Sn30 show a clear low-temperature relaxation peak attributed to the influence of Ba rattling dynamics on the framework-atom resonance, with a quadrupolar relaxation mechanism as the leading contribution. Data are analyzed using a two-phonon Raman process, according to a recent theory involving localized anharmonic oscillators. Excellent agreement is obtained using this model, with the parameters corresponding to a uniform array of localized oscillators with very large anharmonicity. 2011 American Physical Society.

published proceedings

  • Physical Review B

author list (cited authors)

  • Zheng, X., Rodriguez, S. Y., & Ross, J. H

publication date

  • January 1, 2011 11:11 AM