2009 Fiscal Year Final Research Report
Nonlinear and spin-dependent transport in correlated electron insulators at ultra low temperatures
| Project/Area Number |
20740208
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
YAMAGUCHI Takahide National Institute for Materials Science, 超伝導材料センター, 主任研究員 (70399385)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 分子性固体 / 有機導体 |
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| Research Abstract |
We have measured the dielectric constant of the molecular crystal theta-(BEDT-TTF)_2CsZn(SCN)_4, which is a correlated electron insulator, at ultra low temperatures in a wide frequency range. Ruling out the effect of the sample-electrode interface, we found a large anisotropy in the dielectric constant, which is consistent with its nonlinear conductivity, and obtained dynamical properties of electron-hole excitations. We have also investigated the transport properties under electron-spin-resonance conditions to clarify the origin of a giant magnetoresistance of the molecular crystal.
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