INVESTIGATION OF ELECTRONIC PROPERTY NEAR THE METAL TO NONMETAL TRANSITION FOR Pd OXIDES
| Project/Area Number |
11640359
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | SCIENCE UNVERSITY OF TOKYO |
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Principal Investigator |
TSUDA Nobuo SCIENCE UNIVERSITY OF TOKYO, FACULTY OF SCIENCE PROFESSOR, 理学部, 教授 (20155386)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2000: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1999: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Pd OXIDE / METAL TOINSULATOR TRANSITION / CONDUCTIVE OXIDE / KONDO EFFECT / MAGNETIC SUSCEPTIBILITY / ELECTRICAL RESISTIVITY / NEARLY ANTIFERROMAGNETIC METAL / 反強磁性的金属 / パラジウム酸化物 / 銅パラジウム酸化物 / 金属・絶縁体転移 |
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| Research Abstract |
The logarithmic temperature dependence was found for Cu doped Ca_<1-x>Na_xPd_<3-y>Cu_yO_4 which is metallic (x > 0.3). This was analyzed by using the Hamann equation for the Kondo scattering, and TK was found to be about 8 K.
The magnetic susceptibility was measured for Ca_<1-x>Na_xPd_3O_4. The susceptibility slightly increased with decreasing temperature, and it was analyzed by using the Hasegawa-Moriya theory for nearly antiferromagnetic metal. The intraatomic Coulomb repulsion was 4.9 to 3.3 eV depending on the composition.
No superconductivity was found down to 2 K.
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Report
(3 results)
Research Products
(5 results)
