| Budget Amount *help |
¥19,630,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥4,530,000)
Fiscal Year 2014: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2013: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
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| Outline of Final Research Achievements |
In this study, we investigated the mechanism of the giant magnetoresistance observed in the phthalocyanine (Pc) molecular conductor. We found that the x-ray absorption spectra are sensiive to the Pc molecular charge just above the Fe K edge, and tried to detect the charge order of the pi conduction electron by measuring the resonant x-ray scattering. We found that the intramolecular interaction between the pi conduction electron and the d local moment is a ferromagnetic one, which is larger than 500K. This indicates that the magnetic order of the local moments controls the stability of the charge order in the pi conduction electron system. We reduced the density of the local moments by substituting with the Co atom, and observed the giant magnetoresistance in the low spin density. This giant magnetoresistance cannot be explained by the conventional model such as the manganese oxides, indicating the nontrivial electronic state.
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