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We present a systematic study of thermal conductivity, specific heat,electrical resistivity, thermopower and x-ray diffraction measurementsperformed on single-crystalline samples of the pseudoquaternary type-Iclathrate system Sr8Ga16Si30-xGex, in the full range of 0 < x < 30. All thesamples show metallic behavior with n-type majority carriers. However, thethermal conductivity and specific heat strongly depend on x. Upon increasing xfrom 0 to 30, the lattice parameter increases by 3%, from 10.446 to 10.726 A,and the localized vibrational energies of the Sr guest ions in thetetrakaidekahedron (dodecahedron) cages decrease from 59 (120) K to 35 (90) K.Furthermore, the lattice thermal conductivity at low temperatures is largelysuppressed. In fact, a crystalline peak found at 15 K for x = 0 graduallydecreases and disappears for x > 20, evolving into the anomalous glass-likebehavior observed for x = 30. It is found that the increase of the free spacefor the Sr guest motion directly correlates with a continuous transition fromon-center harmonic vibration to off-center anharmonic vibration, withconsequent increase in the coupling strength between the guest's low-energymodes and the cage's acoustic phonon modes.Comment: 7 pages, 7 figures, submitted to PR

physical review. b, condensed matter and materials physics

Cage-size control of guest vibration and thermal conductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>8</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ga</mml:mi><mml:mn>16</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Si</mml:mi><mml:mrow><mml:mn>30</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Ge</mml:mi><mml:…

Cage-size control of guest vibration and thermal conductivity inSr8Ga16Si30−xGe