Giant Magnetoresistance Effect in the Metal-Insulator Transition of Pyrochlore Oxide Nd2Ir2O7

Abstract

We investigated the magnetoresistance (MR) effect of the pyrochlore oxide Nd2Ir2O7, which shows a metal-insulator transition at T_MI =33 K. A small positive MR effect was observed in the metallic state above T_MI, while a large negative MR effect was observed in the insulating state below T_MI . MR effects exceeding 3000% were found at 1 K at a field of 9 T. As a result, we confirmed the crossover from the insulating state to a state with a small or partial band gap in a field up to 56 T. Furthermore, from the MR effect in Eu2Ir2O7 (T_MI = 120 K) and Gd${}_2$Ir${}_2$O${}_7$ (T_MI = 127 K), we revealed that the large negative MR effect of the pyrochlore iridate Ln2Ir2O7 depends on the magnetism of the lanthanide Ln^{3+} ion. The d-f interaction plays a significant role in the large negative MR effect in the insulating state.

arXiv comment10 pages, 4 figures

References in corpus (6)

• Mott physics and band topology in materials with strong spin-orbit interaction
• Transport Properties of the Kondo Lattice Model in the Limit $S=\infty$ and $D=\infty$
• Static Critical Behavior of the Spin-Freezing Transition in the Geometrically Frustrated Pyrochlore Antiferromagnet Y2Mo2O7
• Emergence of magnetic long-range order in frustrated pyrochlore Nd${}_2$Ir${}_2$O${}_7$ with metal-insulator transition
• Continuous Transition between Antiferromagnetic Insulator and Paramagnetic Metal in the Pyrochlore Iridate Eu2Ir2O7
• Metal-insulator Transition in a Pyrochlore-type Ruthenium oxide, Hg2Ru2O7

Cited by in corpus (18)

• Magnetic field-induced insulator-semimetal transition in a pyrochlore Nd2Ir2O7
• Direct Evidence for the 'All-in/All-out' Magnetic Structure in the Pyrochlore Iridates from $\mu$SR
• Metallic Interface Emerging at Magnetic Domain Wall of Antiferromagnetic Insulator---Fate of Extinct Weyl Electrons
• Pressure and magnetic-field effects on metal-insulator transitions of bulk and domain-wall states in pyrochlore iridates
• Magnetic order in pyrochlore iridate Nd${}_2$Ir${}_2$O${}_7$ probed by muon spin relaxation
• Comparative studies of low temperature X-ray diffraction experiments on R2Ir2O7 (R = Nd, Eu, and Pr)
• All-in-all-out magnetic domain wall conduction in pyrochlore iridate heterointerface
• Anatomy of Topological Surface States: Exact Solutions from Destructive Interference on Frustrated Lattices
• All-in-all-out magnetic domain size in pyrochlore iridate thin films as probed by local magnetotransport
• First-principles study on cubic pyrochlore iridates Y2Ir2O7 and Pr2Ir2O7
• Modulated Helical Metals at Magnetic Domain Walls of Pyrochlore Iridium Oxides
• Anisotropic Quantum Spin Hall Effect, Spin-Orbital Textures and Mott Transition
• Shape of magnetic domain walls formed by coupling to mobile charges
• Anomalous Magnetoresistance by Breaking Ice Rule in Bi2Ir2O7/Dy2Ti2O7 Heterostructure
• Role of f-d exchange interaction and Kondo scattering in Nd doped pyrochlore Iridate (Eu1-xNdx)2Ir2O7
• Electron Correlation Effects on Topological Phases
• Traversing the pyrochlore stability diagram; microwave-assisted synthesis and discovery of mixed B-site Ln${}_2$InSbO${}_7$ family
• Flux roughening in spin ice with mixed $\pm J$ interactions