Decoupling of the antiferromagnetic and insulating states in Tb-doped Sr2IrO4

Wang, J. C.; Aswartham, S.; Ye, Feng; Terzic, J.; Zheng, H.; Haskel, Daniel; Chikara, Shalinee; Choi, Yong; Schlottmann, P.; Custelcean, Radu; Yuan, S. J.; Cao, G.

doi:10.1103/PhysRevB.92.214411

Title: Decoupling of the antiferromagnetic and insulating states in Tb-doped Sr₂IrO₄

Journal Article · Tue Dec 08 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.214411· OSTI ID:1248025

Wang, J. C. ^[1]; Aswartham, S. ^[2]; Ye, Feng ^[3]; Terzic, J. ^[2]; Zheng, H. ^[2]; Haskel, Daniel ^[4]; Chikara, Shalinee ^[5]; Choi, Yong ^[4]; Schlottmann, P. ^[6]; Custelcean, Radu ^[7]; Yuan, S. J. ^[2]; Cao, G. ^[2]

Univ. of Kentucky, Lexington, KY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Renmin Univ. of China, Beijing (China)
Univ. of Kentucky, Lexington, KY (United States)
Univ. of Kentucky, Lexington, KY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Florida State Univ., Tallahassee, FL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sr₂IrO₄ is a spin-orbit coupled insulator with an antiferromagnetic (AFM) transition at TN=240 K. We report results of a comprehensive study of single-crystal Sr₂Ir_1-xTb_xO₄ (0 x 0.03). This study found that mere 3% (x=0.03) tetravalent Tb⁴⁺(4f⁷) substituting for Ir⁴⁺ (rather than Sr²⁺) completely suppresses the long-range AFM transition but stabilizes the insulating state, leading to a phase diagram featuring a decoupling of magnetic interactions and charge gap. The insulating state at x=0.03 is characterized by an unusually large specific heat at low temperatures and an incommensurate magnetic state having a magnetic peak at (0.95, 0, 0) in the neutron diffraction. It is apparent that Tb doping effectively changes the relative strength of the SOI and the tetragonal CEF and enhances the Hund's rule coupling that competes with the SOI, and destabilizes the AFM state. However, the disappearance of the AFM accompanies no metallic state chiefly because an energy level mismatch for the Ir and Tb sites weakens charge carrier hopping and renders a persistent insulating state. This work highlights an unconventional correlation between the AFM and insulating states in which the magnetic transition plays no critical role in formation of charge gap in the iridate.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; FG02-98ER45707; AC05-00OR22725

OSTI ID:: 1248025

Alternate ID(s):: OSTI ID: 1228425; OSTI ID: 1324063

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 21; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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The challenge of spin–orbit-tuned ground states in iridates: a key issues review Cao, Gang; Schlottmann, Pedro Reports on Progress in Physics, Vol. 81, Issue 4 https://doi.org/10.1088/1361-6633/aaa979	journal	February 2018
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Single-phased chromaticity-tunable phosphor of Sr ₄ Al ₁₄ O ₂₅ : Eu ^2+/3+ co-doped with Tb ³⁺ for white-light-emitting diodes Wang, Ziyao; Wang, Baochen; Liu, Yangai Materials Research Express, Vol. 6, Issue 11 https://doi.org/10.1088/2053-1591/ab45b7	journal	September 2019
Synthesis and physical properties of the new iridium oxyfluoride $S r_{2} Ir {(O, F)}_{6 - δ}$ using a topochemical reaction method Kuramochi, K.; Shimano, T.; Nishio, T. Physical Review Materials, Vol. 4, Issue 1 https://doi.org/10.1103/physrevmaterials.4.013403	journal	January 2020
Decoupling of magnetism and electric transport in single-crystal (Sr1-xAx)2IrO4 (A = Ca or Ba) Zhao, H. D.; Terzic, J.; Zheng, H. arXiv https://doi.org/10.48550/arxiv.1712.05518	text	January 2017
The Jeff=1/2 antiferromagnet Sr2IrO4: A golden avenue toward new physics and functions Lu, Chengliang; Liu, Jun-Ming arXiv https://doi.org/10.48550/arxiv.2110.12877	text	January 2021

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Title: Decoupling of the antiferromagnetic and insulating states in Tb-doped Sr2IrO4

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Title: Decoupling of the antiferromagnetic and insulating states in Tb-doped Sr₂IrO₄