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We present magnetization and Hall effect measurements on the pyrochloreiridate Nd2Ir2O7. Previous muon spin rotation measurements have shown that thesystem undergoes an unusual transition at T$_M$ = 110 K into a magnetic phaselacking long-range order, followed by a transition at T$_LRO$ = 6 K into astate with long-range magnetic order. We observe a small remnant magnetizationwhen cycling through zero magnetic field at temperatures below T$_M$. BelowT$_LRO$, this remnant magnetization increases sharply, and new hysteresiseffects appear at a higher field B$_c$ = 2.5 T, while the Hall resistancedevelops a non-monotonic and hysteretic magnetic field dependence, with amaximum at B$_c$ and signatures of an anomalous Hall effect. The dependence onfield sweep direction demonstrates a non-trivial transition into a magneticallyordered state with properties paralleling those of known spin-ice systems andsuggests a spin reorientation transition across the metal insulator transitionin the A-227 series.

Magnetization and Hall effect studies on the pyrochlore iridate Nd2Ir2O7