Correlation between antiferromagnetic and Mott states in spin orbit coupled Sr2IrO4: A study of Sr2Ir1–xMxO4 (M=Fe or Co)

Hu, Bing; Zhao, Hengdi; Zhang, Yu; Schlottmann, Pedro; Ye, Feng; Cao, Gang

doi:10.1103/physrevb.103.115122

Correlation between antiferromagnetic and Mott states in spin orbit coupled ${Sr}_{2} Ir O_{4}$ : A study of ${Sr}_{2} {Ir}_{1 - x} M_{x} O_{4}$ ( $M = Fe$ or Co)

Journal Article · Mon Mar 15 00:00:00 EDT 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.103.115122· OSTI ID:1819586

^[1]; Zhao, Hengdi ^[2]; Zhang, Yu ^[2]; ^[3]; ^[4]; ^[2]

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)

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 Sr₂Ir_1–xFe_xO₄ (0 ≤ x < 0.32) and Sr₂Ir_1–xCo_xO₄ (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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1819586

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 11 Vol. 103; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Correlation between antiferromagnetic and Mott states in spin orbit coupled ${Sr}_{2} Ir O_{4}$ : A study of ${Sr}_{2} {Ir}_{1 - x} M_{x} O_{4}$ ( $M = Fe$ or Co)