Spin-Glass-like Transition and Hall Resistivity of Y2-xBixIr2O7

TL;DR

This study investigates the magnetic and electrical properties of Y2-xBixIr2O7, revealing a spin-glass-like transition with hysteresis in Hall resistivity and anomalies in resistivity and thermoelectric power around the transition temperature.

Contribution

It reports the observation of a spin-glass-like transition and hysteretic Hall resistivity in Y2-xBixIr2O7, highlighting novel magnetic and transport phenomena in this pyrochlore oxide.

Findings

Magnetization differs between ZFC and FC below TG.

Electrical resistivity and thermoelectric power show anomalies at TG.

Hall resistivity exhibits hysteresis below TG.

Abstract

Various physical properties of the pyrochlore oxide Y2-xBixIr2O7 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=TG. The anomalous T-dependence of the electrical resistivities r and the thermoelectric powers S observed at around TG 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 rH measured with the ZFC and FC conditions are found to have different values, too, in the low temperature phase (T<TG). Possible mechanisms which induce such the hysteretic behavior are discussed.