| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Research Abstract |
The stella quadrangula lattice, which is a cornner-shared netwark of stella quadrangula units consisting of two nested tetrahedra with same center of gravity, is a novel frustrated lattice. In the eta-carbide compounds, the magnetic 3d atoms form the stella quadrangula lattice, and hence, new phenomena caused by the new geometric magnetic frustration are expected. We investigated two eta-carbide compounds, Fe3Mo3N and Fe6W6C, by means of magnetization, electrical resistivity, thermal conductivity, thermal expansion, magetostriction, and muSR experiments, and discovered intriguing phenomena.
Fe3Mo3N shows a ferromagnetic quantum critical behavior as well as a random spin freezing, indicating the ferromagnetic order is suppressed by the geometric frustration. Fe6W6C shows a successive spin freezing caused by the geometric frustration originating from two tetrahedra in the stella quadrangula. These results are caused by the inherent frustration of the stella quadrangula lattice.
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