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

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

2011-10-30

arxiv.org/abs/1110.6605v2

J. Phys. Soc. Jpn 81, 034709 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 1 table, 3 figures

Scientific paper

10.1143/JPSJ.81.034709

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 $T_{\rm MI}$ 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\pm0.4$$\mu_{\rm B}$, where $\mu_{\rm B}$ is the Bohr magneton. The inelastic scattering measurements revealed that the Kramers ground doublet of Nd$^{3+}$ splits below $T_{\rm MI}$. 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.

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