Dilute stuffing in the pyrochlore iridate 
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Telang, Prachi; Mishra, Kshiti; Sood, Anil K.; Singh, Surjeet

doi:10.1103/physrevb.97.235118

Cited by 26 publications

(12 citation statements)

References 45 publications

(69 reference statements)

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“…Bragg peaks were slightly asymmetric, indicative of a distribution of strains in the bulk which is commonly observed for pyrochlore samples. 24 In the pyrochlore structure there are four sites A 2 B 2 O 6 O , which are located at the 16d, 16c, 48f , and 8b Wyckoff positions respectively. The cubic lattice constant a decreases with Ca substitution (Table I) in accordance with Vegard's law, as expected since 8-coordinate Ca 2+ ionic radii are nearly 1% smaller than Nd 3+ .…”

Section: A Average and Local Lattice Structure Measurementsmentioning

confidence: 99%

Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate (Nd1−xCax)2Ir

et al. 2019

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We report on the evolution of the thermal metal-insulator transition in polycrystalline samples of Nd2Ir2O7 upon hole-doping via substitution of Ca 2+ for Nd 3+ . Ca substitution mediates a fillingcontrolled Mott-like transition with minimal resolvable structural changes and without altering site symmetry. Local structure confirms that Ca substitution does not result in local chemical phase separation, and absorption spectroscopy establishes that Ir cations maintain a spin-orbit entangled electronic configuration. The metal-insulator transition coincides with antiferromagnetic ordering on the Ir sublattice for all measured samples, and both decrease in onset temperature with Ca content. Weak low-temperature upturns in susceptibility and resistivity for samples with high Ca content suggest that Nd sublattice antiferromagnetism continues to couple to carriers in the metallic regime.arXiv:1908.04874v1 [cond-mat.mtrl-sci]

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Section: A Average and Local Lattice Structure Measurementsmentioning

confidence: 99%

Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate (Nd1−xCax)2Ir

et al. 2019

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“…The details of synthesis protocol are similar to that given in Ref. [20]. The lattice parameters were obtained using the Rietveld refinement done on very high-resolution synchrotron data (MCX at ELETTRA).…”

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confidence: 99%

Anomalous lattice contraction and emergent electronic phases in Bi-doped Eu2Ir2O7

et al. 2019

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We study the pyrochlore series (Eu1−xBix)2Ir2O7 for 0 ≤ x ≤ 1. We show that for small x, the lattice undergoes an anomalous contraction but the all-in/all-out and metal-to-insulator transitions remain robust, and the resistivity approaches a 1/T dependence at low-T, suggesting proximity to the Weyl semimetallic phase, as previously predicted theoretically. At the boundary between Eu2Ir2O7 and Bi2Ir2O7 a qualitatively different ground state emerges, which is characterized by its unusual metallic behavior and absence of magnetic ordering at least down to 0.02 K.

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“…We note that in the pyrochlore literature the reverse of this defect (occupation of the B-site by the A-site ion) is referred to as "stuffing" and has been studied extensively (see, for example, [33,34,41]). The situation here, termed "negative" stuffing, has been the subject of considerably fewer studies [45][46][47].…”

Section: Discussionmentioning

confidence: 99%

Evaluating the Effects of Structural Disorder on the Magnetic Properties of Nd$_{2}$Zr$_{2}$O$_{7}$

Zoghlin,

Schmehr,

Holgate

et al. 2021

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Motivated by the variation in reported lattice parameters of floating-zone-grown Nd2Zr2O7 crystals, we have performed a detailed study of the relationship between synthesis environment, structural disorder, and magnetic properties. Using a combination of polycrystalline standards, electron-probe microanalysis and scattering techniques, we show that crystals grown under atmospheric conditions have a reduced lattice parameter (relative to pristine polycrystalline powders) due to occupation of the Nd-site by excess Zr (i.e. "negative" stuffing). In contrast, crystals grown under high-pressure Ar are nearly stoichiometric with an average lattice parameter approaching the polycrystalline value. While minimal disorder of the oxygen sublattices is observed on the scale of the average structure, neutron pair-distribution function analysis indicates a highly local disorder of the oxygen coordination, which is only weakly dependent on growth environment. Most importantly, our magnetization, heat capacity and single-crystal neutron scattering data show that the magnetic properties of crystals grown under high-pressure Ar match closely with those of stoichiometric powders. The neutron scattering measurements reveal that the signature of magnetic moment fragmentation -the coexistence of "all-in-all-out" (AIAO) magnetic Bragg peaks and diffuse pinch-point scattering due to spin-ice correlations -persists in these nearly stoichiometric crystals. However, in addition to an increased AIAO transition temperature, the diffuse signal remains significant to higher temperatures than previously reported. This behavior indicates that both the AIAO magnetic order and the spin-ice correlations are sensitive to deviations of the Nd stoichiometry.

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Dilute stuffing in the pyrochlore iridate Eu2Ir2O7

Cited by 26 publications

References 45 publications

Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate (Nd1−xCax)2Ir

Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate (Nd1−xCax)2Ir

Anomalous lattice contraction and emergent electronic phases in Bi-doped Eu2Ir2O7

Evaluating the Effects of Structural Disorder on the Magnetic Properties of Nd$_{2}$Zr$_{2}$O$_{7}$

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