Variation of Charge Dynamics in the Course of Metal-Insulator Transition for Pyrochlore-TypeNd2Ir2O7
Abstract
We have spectroscopically investigated the thermally and doping-induced metal-insulator transitions for pyrochlore-type Nd2Ir2O7 as well as its Rh-doped analogs Nd2(Ir(1-x)Rh(x))(2)O(7), where the spin-orbit interaction as well as the electron correlation is effectively tuned by the doping level (x). The charge dynamics dramatically changes on an energy scale of 1 eV in the course of thermally and doping-induced metal-insulator transitions, while the insulating ground state shows a small but well-defined charge gap of 45 meV. Anomalous doping variation of the low-energy (<0.3 eV) optical-conductivity spectra at the ground state can be interpreted in terms of the phase changes among the narrow-gap Mott insulator, Weyl semimetal, and correlated metal.
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Alloying with Rhodium, which substitutes for Iridium, leads to a state where linear-in-frequency optical conductivity is observed as expected in a Weyl semimetal.
“However, proximity of a Weyl phase is indicated in other experiments including A=Eu under pressure (Tafti et al. , 2012), and alloying with Rhodium (that substitutes for Iridium) leads to a state where linear in frequency optical conductivity is observed as expected in a WSM (Ueda et al. , 2012).”
From Weyl and Dirac semimetals in three-dimensional solids (2018) · cites this paper as Ueda et al., 2012
Cites
Wan, X., Turner, A. M., Vishwanath, A., & Savrasov, S. Y. (2011) · Physical Review B · doi:10.1103/physrevb.83.205101 · Cited by 4,718 · see citing works
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Weyl and Dirac semimetals in three-dimensional solids
Armitage, N. P., Mele, E. J., & Vishwanath, A. (2018) · Reviews of Modern Physics · doi:10.1103/revmodphys.90.015001 · Cited by 4,528 · see citing works
“The magnetically ordered pyrochlores, such as A=Eu, Nd are seen, in clean samples, to be insulating at low temperatures (Ishikawa et al., 2012; Tafti et al., 2012; Tian et al., 2016; Ueda et al., 2012, 2015b).”
BackgroundTopological Insulator Materials
Ando, Y. (2013) · Journal of the Physical Society of Japan · doi:10.7566/jpsj.82.102001 · Cited by 1,789 · see citing works
Recent developments in transport phenomena in Weyl semimetals
Hosur, P., & Qi, X. (2013) · Comptes Rendus. Physique · doi:10.1016/j.crhy.2013.10.010 · Cited by 743 · see citing works
Field-induced quantum metal–insulator transition in the pyrochlore iridate Nd2Ir2O7
Tian, Z., Kohama, Y., Tomita, T., Ishizuka, H., Hsieh, T. H., Ishikawa, J. J., Kindo, K., Balents, L., & Nakatsuji, S. (2016) · Nature Physics · doi:10.1038/nphys3567 · Cited by 145 · see citing works
Weyl and Dirac Semimetals in Three Dimensional Solids
Armitage, N. P., Mele, E. J., & Vishwanath, A. (2017) · arXiv
“The magnetically ordered pyrochlores, such as A=Eu, Nd are seen, in clean samples, to be insulating at low temperatures (Ishikawa et al., 2012; Tafti et al., 2012; Tian et al., 2016; Ueda et al., 2012, 2015b).”
Background
- Authors
- Ueda, K., Fujioka, J., Takahashi, Y., Suzuki, T., Ishiwata, S., Taguchi, Y., & Tokura, Y.
- Affiliations
- The University of Tokyo (JP)
- RIKEN Advanced Science Institute (JP)
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2012-09-27
- Volume
- 109
- Issue
- 13
- Pages
- 136402-136402
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2315052866
- Cited by
- 118
- References
- 1
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 8 · 2023: 1 · 2022: 3 · 2021: 15 · 2020: 12 · 2019: 9 · 2018: 8 · 2017: 14 · 2016: 10 · 2015: 16 · 2014: 9 · 2013: 6
- FWCI
- 6.74
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science (24840012, 23840010)
- Topics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Magnetic and transport properties of perovskites and related materials
- Keywords
- Nd2Ir2O7, pyrochlore iridates, metal-insulator transition, charge dynamics, charge gap, spin-orbit coupling, electron correlation, Rh doping, optical conductivity, Mott insulator, Weyl semimetals, correlated metals, phase transitions
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