| 摘要 |
An electrically conductive substance having a pyrochlore structure which is represented by the general formula R2Ir2O7, wherein R represents one or more elements selected from the rare earth elements: La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Z. The substance is a novel substance which exhibits both of useful characteristics of the geometrically frustrated state, wherein magnetic state is controllable by an external magnetic field or the like, and a good electrical cnductivity which leads to electric controllability and utilization of accumulated heat. In particular, the above conductive substance wherein R represents one or more elements selected from among La, Ce, Pr, Nd, Pm, Sm, and Eu exhibits metallic electrical conductivity characteristics, and therefore is useful as a functional electronic material having magnetic controllabiltity and a heat accumulating material having a large heat capacity.
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