Emergence of magnetic long-range order in frustrated pyrochlore Nd${}_2$Ir${}_2$O${}_7$ with metal-insulator transition

Abstract

In this study, we performed powder neutron diffraction and inelastic scattering measurements of frustrated pyrochlore Nd${}_2$Ir${}_2$O${}_7$, which exhibits a metal-insulator transition at a temperature $T_{\mathrm{MI}}$ of 33 K. The diffraction measurements revealed that the pyrochlore has an antiferromagnetic long-range structure with propagation vector ${\vec{q}}_0$ of (0,0,0) and that it grows with decreasing temperature below 15 K. This structure was analyzed to be of the all-in all-out type, consisting of highly anisotropic Nd${}^{3+}$ magnetic moments of magnitude $2.3\pm 0.4$${\mu }_{\mathrm{B}}$, where ${\mu }_{\mathrm{B}}$ is the Bohr magneton. The inelastic scattering measurements revealed that the Kramers ground doublet of Nd${}^{3+}$ splits below $T_{\mathrm{MI}}$. This suggests the appearance of a static internal magnetic field at the Nd sites, which probably originates from a magnetic order consisting of Ir${}^{4+}$ magnetic moments. Here, we discuss a magnetic structure model for the Ir order and the relation of the order to the metal-insulator transition in terms of frustration.

6 pages, 1 table, 3 figures

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• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Molecular spin resonance in the geometrically frustrated MgCr2O4 magnet by inelastic neutron scattering
• Metal-insulator Transition in a Pyrochlore-type Ruthenium oxide, Hg2Ru2O7

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