Abstract
The magnetic susceptibility χ m was measured for Ca1-xNaxPd3O4 between 2 K and 300 K. The intrinsic part of the observed χ m is expressed by both the Curie-Weiss and the Hasegawa-Moriya formula, and Ca1-xNaxPd3O4 (x>0.3) is a metal in which the magnetic interaction between itinerant electrons will be antiferromagnetic. When analyzed by the latter theory, the Coulomb repulsion energy at an atomic site becomes 4.9 eV to 3.3 eV depending on the carrier density. Similarity and dissimilarity with high-Tc cuprates are discussed since the oxide is not superconducting at least above 2 K.
