2000 Fiscal Year Final Research Report Summary

INVESTIGATION OF ELECTRONIC PROPERTY NEAR THE METAL TO NONMETAL TRANSITION FOR Pd OXIDES

Research Project

Project/Area Number	11640359
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	固体物性Ⅱ(磁性・金属・低温)
Research Institution	SCIENCE UNVERSITY OF TOKYO
Principal Investigator	TSUDA Nobuo SCIENCE UNIVERSITY OF TOKYO, FACULTY OF SCIENCE PROFESSOR, 理学部, 教授 (20155386)
Project Period (FY)	1999 – 2000
Keywords	Pd OXIDE / METAL TOINSULATOR TRANSITION / CONDUCTIVE OXIDE / KONDO EFFECT / MAGNETIC SUSCEPTIBILITY / ELECTRICAL RESISTIVITY / NEARLY ANTIFERROMAGNETIC METAL / 反強磁性的金属
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.