| Budget Amount *help |
¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000)
Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2011: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2010: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2009: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
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| Research Abstract |
We have performed systematic ultrasonic measurement on 3-20-6 type clathrate compounds and filled-skutterudite compounds to elucidate rattling and tunneling with cage-like nano-space. In the R_3Pd_20Ge_6 multi-structured ultrasonic dispersions in the elastic constant C_44 were observed. On the other hand, we revealed rattling does not emerge in the R_3Pd_20Si_6. These results evidences that conduction bands participate in the formation of anharmonic vibration with Γ_5-type charge fluctuation using the path of electron-phonon interaction. In addition, we found antiferro-type qoadrupole ordering of 8c site at 250 mK and successively of 4a site at 60 mK in Pr_3Pd_20Ge_6.
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