The extraordinary Hall resistivity ρex and the magnetization M of canonical spin glass AuMn with 8 at% Mn were measured simultaneously as a function of temperature with close attention to thermal and magnetic field hysteresis. The data of ρex show an anomaly at the spin glass transition temperature Tg. Moreover, the anomalous Hall coefficient RS ∼ ρex / M, which represents the chiral susceptibility of the system in the present case, also shows the anomaly. In conventional theories, the extraordinary Hall resistivity ρex is represented, ρex = M (A ρ + B ρ2), where ρ is the resistivity, and A and B are constants. Since ρ (T) is monotonic and smooth, the behavior of ρex / M clearly indicates that another term has to be included in the expression of ρex. The results can be interpreted consistently in terms of a chirality ordering model of canonical spin glasses. We argue the critical phenomena of the spin glass transition from Hall effect measurements in comparison with that from magnetization measurements.
ASJC Scopus subject areas
- Condensed Matter Physics