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Title: Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate ( Nd 1 x Ca x ) 2 Ir 2 O 7

Abstract

We report on the evolution of the thermal metal-insulator transition in polycrystalline samples of Nd2Ir2O7 upon hole doping via substitution of Ca2+ for Nd3+. Ca substitution mediates a filling-controlled 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. As a result, 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.

Authors:
 [1];  [1];  [2];  [2];  [3];  [4];  [4]; ORCiD logo [2];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Bates College, Lewiston, ME (United States)
  3. Cornell Univ., Ithaca, NY (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
US Army Research Office (ARO); National Science Foundation (NSF); USDOE Office of Science (SC)
OSTI Identifier:
1577100
Alternate Identifier(s):
OSTI ID: 1550583
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Porter, Zach, Zoghlin, Eli, Britner, Samuel, Husremovic, Samra, Ruff, Jacob P.C., Choi, Yongseong, Haskel, Daniel, Laurita, Geneva, and Wilson, Stephen D. Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate (Nd1–xCax)2Ir2O7. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.054409.
Porter, Zach, Zoghlin, Eli, Britner, Samuel, Husremovic, Samra, Ruff, Jacob P.C., Choi, Yongseong, Haskel, Daniel, Laurita, Geneva, & Wilson, Stephen D. Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate (Nd1–xCax)2Ir2O7. United States. https://doi.org/10.1103/PhysRevB.100.054409
Porter, Zach, Zoghlin, Eli, Britner, Samuel, Husremovic, Samra, Ruff, Jacob P.C., Choi, Yongseong, Haskel, Daniel, Laurita, Geneva, and Wilson, Stephen D. Thu . "Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate (Nd1–xCax)2Ir2O7". United States. https://doi.org/10.1103/PhysRevB.100.054409. https://www.osti.gov/servlets/purl/1577100.
@article{osti_1577100,
title = {Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate (Nd1–xCax)2Ir2O7},
author = {Porter, Zach and Zoghlin, Eli and Britner, Samuel and Husremovic, Samra and Ruff, Jacob P.C. and Choi, Yongseong and Haskel, Daniel and Laurita, Geneva and Wilson, Stephen D.},
abstractNote = {We report on the evolution of the thermal metal-insulator transition in polycrystalline samples of Nd2Ir2O7 upon hole doping via substitution of Ca2+ for Nd3+. Ca substitution mediates a filling-controlled 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. As a result, 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.},
doi = {10.1103/PhysRevB.100.054409},
journal = {Physical Review B},
number = 5,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}

Journal Article:

Citation Metrics:
Cited by: 1 work
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Figures / Tables:

FIG. 1 FIG. 1: Synchrotron XRD patterns in circles, all taken at 300 K. Calculated curves include the pyrochlore phase and the impurity phases Ir, IrO2, and Nd2O3. Lines above the residual curves index only pyrochlore peaks.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.