2013 Fiscal Year Final Research Report
Neutron scattering investigation of the novel itinerant-electron frustration
| Project/Area Number |
23740267
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Kyoto University |
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Principal Investigator |
TABATA Yoshikazu 京都大学, 工学(系)研究科(研究院), 准教授 (00343244)
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| Project Period (FY) |
2011 – 2013
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| Keywords | フラストレーション / 量子臨界現象 / スピン凍結 / muSR |
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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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