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Li Y, Niu R, Xu F, Zhen W, Huang H, Wang J, Zhu W, Zhang C. Enhanced magnetism and persistent insulating state in Mn doped Sr 2IrO 4. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:235602. [PMID: 35290974 DOI: 10.1088/1361-648x/ac5e05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
The influences of Mn substitution at the Ir site of Sr2IrO4are investigated via a comprehensive study of the variation of structural parameters, the transport and magnetic properties of the Sr2Ir1-xMnxO4samples. The incorporation of Mn leads to an increase of the in-plane Ir-O-Ir bond angle, while it is not sufficient to drive the Mott-insulating state to a metallic state. Interestingly, we find a coexistence of Ir4+-O2--Ir4+super-exchange interaction and Mn3+-O2--Mn4+double exchange interaction inx⩾ 0.06 samples. The Mn3+-O2--Mn4+ferromagnetic domains are isolated by the Ir4+-O2--Ir4+antiferromagnetic areas, leading to a severely localized electronic and magnetic states. The electron hopping between the localized states dominates the conductivity of the Sr2Ir1-xMnxO4samples.
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Affiliation(s)
- Yaodong Li
- High Magnetic Field Laboratory of Anhui Province, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
- Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Rui Niu
- High Magnetic Field Laboratory of Anhui Province, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
| | - Feng Xu
- High Magnetic Field Laboratory of Anhui Province, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
| | - Weili Zhen
- High Magnetic Field Laboratory of Anhui Province, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
| | - Hui Huang
- High Magnetic Field Laboratory of Anhui Province, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
- Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, People's Republic of China
| | - Jingrong Wang
- High Magnetic Field Laboratory of Anhui Province, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
| | - Wenka Zhu
- High Magnetic Field Laboratory of Anhui Province, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
| | - Changjin Zhang
- High Magnetic Field Laboratory of Anhui Province, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
- Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China
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Magnetic fluctuations driven insulator-to-metal transition in Ca(Ir(1-x)Rux)O3. Sci Rep 2015; 5:18047. [PMID: 26647965 PMCID: PMC4673448 DOI: 10.1038/srep18047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Accepted: 11/11/2015] [Indexed: 11/08/2022] Open
Abstract
Magnetic fluctuations in transition metal oxides are a subject of intensive research because of the key role they are expected to play in the transition from the Mott insulator to the unconventional metallic phase of these materials, and also as drivers of superconductivity. Despite much effort, a clear link between magnetic fluctuations and the insulator-to-metal transition has not yet been established. Here we report the discovery of a compelling link between magnetic fluctuations and the insulator-to-metal transition in Ca(Ir1-xRux)O3 perovskites as a function of the substitution coefficient x. We show that when the material turns from insulator to metal, at a critical value of x ~ 0.3, magnetic fluctuations tend to change their character from antiferromagnetic, a Mott insulator phase, to ferromagnetic, an itinerant electron state with Hund's orbital coupling. These results are expected to have wide-ranging implications for our understanding of the unconventional properties of strongly correlated electrons systems.
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Birol T, Haule K. J(eff)=1/2 Mott-insulating state in Rh and Ir fluorides. PHYSICAL REVIEW LETTERS 2015; 114:096403. [PMID: 25793833 DOI: 10.1103/physrevlett.114.096403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2014] [Indexed: 06/04/2023]
Abstract
Discovery of new transition metal compounds with large spin orbit coupling coexisting with strong electron-electron correlation among the d electrons is essential for understanding the physics that emerges from the interplay of these two effects. In this study, we predict a novel class of J_{eff}=1/2 Mott insulators in a family of fluoride compounds that are previously synthesized, but not characterized extensively. First principles calculations in the level of all electron density functional theory+dynamical mean field theory indicate that these compounds have large Mott gaps and some of them exhibit unprecedented proximity to the ideal, SU(2) symmetric J_{eff}=1/2 limit.
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Affiliation(s)
- Turan Birol
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Kristjan Haule
- Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
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