| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Research Abstract |
We investigate the origin of the mechanism of the unknown phase transition (rattling transition) on the pyrochlore oxide superconductor β-KO_<s2>O_6. In this research, from a precise single crystal structure analysis, a detailed specific heat measurement, and a NMR measurement, the unusual thermal vibration of the K atom is thought to be a new type of phase transition with the change of the state of thermal vibrations in the oversized cage. This phase transition is the isomorphic structural phase-transition; and it is a very rare example of thermodynamics.
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