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We report a combined muon spin relaxation/rotation, bulk magnetization,neutron scattering, and transport study of the electronic properties of thepyrochlore iridate Nd2Ir2O7. We observe the onset of strongly hystereticbehavior in the temperature dependent magnetization below 120 K, and an abruptincrease in the temperature dependent resistivity below 8 K. Zero field muonspin relaxation measurements show that the hysteretic magnetization is drivenby a transition to a magnetically disordered state, and that below 8 K acomplex magnetically ordered ground state sets in, as evidenced by the onset ofheavily damped spontaneous muon precession. Our measurements point toward theabsence of a true metal-to-insulator phase transition in this material andsuggest that Nd2Ir2O7 lies either within or on the metallic side of theboundary of the Dirac semimetal regime within its topological phase diagram.

Magnetic order and the electronic ground state in the pyrochlore iridate Nd2Ir2O7