NMR study of metallic pyrochlore ruthenium oxides, Bi2Ru2O7 and Pb2Ru2O7−δ Original Research Article

To elucidate the magnetism of metallic pyrochlore oxides, the Knight shift and nuclear spin–lattice relaxation rate have been measured in the metallic pyrochlore oxides, Bi2Ru2O7 and Pb2Ru2O7−δ. The temperature dependence on T1−1 obeys a modified Korringa relation. The correlation factors in the Korringa relation indicate the existence of antiferromagnetic spin fluctuations in the metallic state of these compounds.