Spin-Glass-like Transition and Hall Resistivity of Y_<2-x>Bi_xIr_2O_7 (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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Various physical properties of the pyrochlore oxide Y_<2-x>Bi_xIr_2O_7 have been studied. The magnetizations M measured under the conditions of the zero-field-cooling (ZFC) and the field-cooling (FC) have different values below the temperature T = T_G. The anomalous T-dependence of the electrical resistivities ρ and the thermoelectric powers S observed at around T_G indicates that the behavior of the magnetization is due to the transition to the state with the spin freezing. In this spin-frozen state, the Hall resistivities ρ_H measured with the ZFC and FC conditions are found to have different values, too, in the low temperature phase (T < T_G). Possible mechanisms which induce such the hysteretic behavior are discussed.
社団法人日本物理学会の論文
2003-05-15