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  Weak orbital ordering of Ir t2g states in the double perovskite Sr2CeIrO6

Kanungo, S., Mogare, K., Yan, B., Reehuis, M., Hoser, A., Felser, C., et al. (2016). Weak orbital ordering of Ir t2g states in the double perovskite Sr2CeIrO6. Physical Review B, 93(24): 245148, pp. 1-6. doi:10.1103/PhysRevB.93.245148.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0613-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-01C9-B
Genre: Journal Article

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 Creators:
Kanungo, Sudipta1, Author              
Mogare, Kailash2, Author              
Yan, Binghai3, Author              
Reehuis, Manfred4, Author
Hoser, Andreas4, Author
Felser, Claudia4, Author
Jansen, Martin4, Author
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863427              
4External Organizations, ou_persistent22              

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 Abstract: The electronic and magnetic properties of distorted monoclinic double perovskite Sr2CeIrO6 were examined based on both experiments and first-principles density functional theory calculations. From the calculations we conclude that low-spin-state Ir4+ (5d(5)) forms a rare weakly antiferromagnetic (AFM) orbital ordered state derived from alternating occupation of slightly mixed c(g)(pi) symmetry states in the presence of spin-orbit coupling (SOC). This orbital ordering is caused due to the competition between the comparable strength of Jahn-Teller structural distortion and SOC. We found both electron-electron correlation and SOC are required to drive the experimentally observed AFM-insulating ground state. Electronic structure investigation suggests that this material belongs to the intermediate-SOC regime, by comparing our results with the other existing iridates. This single active site double perovskite provides a rare platform with a prototype geometrically frustrated fcc lattice where among the different degrees of freedom (i.e., spin, orbital, and lattice) SOC, structural distortion, and Coulomb correlation energy scales compete and interact with each other.

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Language(s): eng - English
 Dates: 2016-06-24
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 93 (24) Sequence Number: 245148 Start / End Page: 1 - 6 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008