Correlation between antiferromagnetic and Mott states in spin orbit coupled : A study of ( or Co)
Abstract
Sr2IrO4 is an archetypal spin-orbit-coupled Mott insulator with an antiferromagnetic state below 240 K. Here we report results of our study on single crystals of Sr2Ir1–xFexO4 (0 ≤ x < 0.32) and Sr2Ir1–xCoxO4 (0 ≤ x < 0.22). Fe doping retains the antiferromagnetic state but simultaneously precipitates an emergent metallic state whereas Co doping causes a rapid collapse of both the antiferromagnetic and Mott states, giving rise to a confined metallic state featuring a pronounced linearity of the basal-plane resistivity up to 700 K. The results indicate tetravalent Fe4+ (3d4) ions in the intermediate spin state with S = 1 and Co4+ (3d5) ions in the high spin state with S = 5/2 substituting for Ir4+ (5d5) ions in Sr2IrO4, respectively. The effective magnetic moment closely tracks the Néel temperature as doping increases, suggesting that the spin state of the dopant predominately determines the magnetic properties in doped Sr2IrO4. Furthermore, all relevant properties including charge-carrier density (e.g., 1028/m3), Sommerfeld coefficient (e.g., 19 mJ / mole K2), and Wilson ratio (e.g., 2.6) consistently demonstrate an emergent metallic state that is both robust and highly correlated in the two systems, arising from the percolation of bound states and the weakening of structuralmore »
- Authors:
-
- Univ. of Colorado, Boulder, CO (United States); North China Electric Power University, Beijing (China)
- Univ. of Colorado, Boulder, CO (United States)
- Florida State Univ., Tallahassee, FL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE; National Science Foundation (NSF)
- OSTI Identifier:
- 1819586
- Grant/Contract Number:
- AC05-00OR22725; DMR-1903888
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 103; Journal Issue: 11; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Antiferromagnetism; Magnetic anisotropy; Metal-insulator transition; Spin-orbit coupling; Mott insulators
Citation Formats
Hu, Bing, Zhao, Hengdi, Zhang, Yu, Schlottmann, Pedro, Ye, Feng, and Cao, Gang. Correlation between antiferromagnetic and Mott states in spin orbit coupled Sr2IrO4: A study of Sr2Ir1–xMxO4 (M=Fe or Co). United States: N. p., 2021.
Web. doi:10.1103/physrevb.103.115122.
Hu, Bing, Zhao, Hengdi, Zhang, Yu, Schlottmann, Pedro, Ye, Feng, & Cao, Gang. Correlation between antiferromagnetic and Mott states in spin orbit coupled Sr2IrO4: A study of Sr2Ir1–xMxO4 (M=Fe or Co). United States. https://doi.org/10.1103/physrevb.103.115122
Hu, Bing, Zhao, Hengdi, Zhang, Yu, Schlottmann, Pedro, Ye, Feng, and Cao, Gang. Mon .
"Correlation between antiferromagnetic and Mott states in spin orbit coupled Sr2IrO4: A study of Sr2Ir1–xMxO4 (M=Fe or Co)". United States. https://doi.org/10.1103/physrevb.103.115122. https://www.osti.gov/servlets/purl/1819586.
@article{osti_1819586,
title = {Correlation between antiferromagnetic and Mott states in spin orbit coupled Sr2IrO4: A study of Sr2Ir1–xMxO4 (M=Fe or Co)},
author = {Hu, Bing and Zhao, Hengdi and Zhang, Yu and Schlottmann, Pedro and Ye, Feng and Cao, Gang},
abstractNote = {Sr2IrO4 is an archetypal spin-orbit-coupled Mott insulator with an antiferromagnetic state below 240 K. Here we report results of our study on single crystals of Sr2Ir1–xFexO4 (0 ≤ x < 0.32) and Sr2Ir1–xCoxO4 (0 ≤ x < 0.22). Fe doping retains the antiferromagnetic state but simultaneously precipitates an emergent metallic state whereas Co doping causes a rapid collapse of both the antiferromagnetic and Mott states, giving rise to a confined metallic state featuring a pronounced linearity of the basal-plane resistivity up to 700 K. The results indicate tetravalent Fe4+ (3d4) ions in the intermediate spin state with S = 1 and Co4+ (3d5) ions in the high spin state with S = 5/2 substituting for Ir4+ (5d5) ions in Sr2IrO4, respectively. The effective magnetic moment closely tracks the Néel temperature as doping increases, suggesting that the spin state of the dopant predominately determines the magnetic properties in doped Sr2IrO4. Furthermore, all relevant properties including charge-carrier density (e.g., 1028/m3), Sommerfeld coefficient (e.g., 19 mJ / mole K2), and Wilson ratio (e.g., 2.6) consistently demonstrate an emergent metallic state that is both robust and highly correlated in the two systems, arising from the percolation of bound states and the weakening of structural distortions. Furthermore, this study strongly indicates that the antiferromagnetic and Mott states are correlated in an unconventional manner in Sr2IrO4.},
doi = {10.1103/physrevb.103.115122},
journal = {Physical Review B},
number = 11,
volume = 103,
place = {United States},
year = {Mon Mar 15 00:00:00 EDT 2021},
month = {Mon Mar 15 00:00:00 EDT 2021}
}
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