Metal-Nonmetal Changeover in Pyrochlore Iridates
Open accessAbstract
We report the low temperature properties of a new series of pyrochlore iridates R2Ir2O7 (R = rare-earth elements). We found that the compounds with R = Pr, Sm, Nd, and Eu exhibit metallic conductivity, whereas those with smaller rare-earth ions are nonmetallic. Such metal-nonmetal changeover is attributable to the importance of electron correlation among the Ir 5d electrons. Reflecting the geometrical frustration in the pyrochlore lattice, the rare-earth moments do not exhibit magnetic ordering to temperatures well below the antiferromagnetic Weiss temperature. We have not found any sign of superconductivity down to 0.3 K in these compounds.
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In A2Ir2O7, larger ionic radii of A, such as A=Pr, imply weaker correlations.
“The role of the chemical species A was related to the strength of correlations (Yanagishima and Maeno, 2001), with larger ionic radii (such as A=Pr) implying weaker correlations.”
From Weyl and Dirac semimetals in three-dimensional solids (2018) · cites this paper as Yanagishima and Maeno, 2001
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“The role of the chemical species A was related to the strength of correlations (Yanagishima and Maeno, 2001), with larger ionic radii (such as A=Pr) implying weaker correlations.”
BackgroundRecent developments in transport phenomena in Weyl semimetals
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Armitage, N. P., Mele, E. J., & Vishwanath, A. (2017) · arXiv
“The role of the chemical species A was related to the strength of correlations (Yanagishima and Maeno, 2001), with larger ionic radii (such as A=Pr) implying weaker correlations.”
Background
- Authors
- Yanagishima, D., & Maeno, Y.
- Affiliations
- Kyoto University (JP)
- ORCID
- Maeno, Yoshiteru
- Venue
- Journal of the Physical Society of Japan
- Publisher
- Physical Society of Japan
- Published
- 2001-10
- Volume
- 70
- Issue
- 10
- Pages
- 2880-2883
- ISSN
- 0031-9015 (ISSN-L)
- 1347-4073
- OpenAlex
- W2021124774
- Cited by
- 212
- References
- 0
- Citations by year
- 2026: 3 · 2025: 7 · 2024: 3 · 2023: 7 · 2022: 9 · 2021: 13 · 2020: 12 · 2019: 16 · 2018: 10 · 2017: 16 · 2016: 11 · 2015: 16 · 2014: 12 · 2013: 18 · 2012: 18
- FWCI
- 1.82
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Journal of the Physical Society of Japan (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Rare-earth and actinide compounds
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Keywords
- pyrochlore iridates, metal-nonmetal transition, electron correlation, geometric frustration, rare-earth moments, superconductivity, rare-earth ions
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