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Title: Anisotropic antiferromagnetic order in the spin-orbit coupled trigonal-lattice Ca 2 Sr 2 IrO 6

Abstract

Here, we used single-crystal x-ray and neutron diffraction to investigate the crystal and magnetic structures of trigonal lattice iridate Ca2Sr2IrO6. The crystal structure is determined to be R¯3 with two distinct Ir sites. The system exhibits long-range antiferromagnetic order below TN = 13.1 K. The magnetic wave vector is identified as (0,0.5,1) with ferromagnetic coupling along the a axis and antiferromagnetic correlation along the b axis. Spins align dominantly within the basal plane along the [1,2,0] direction and tilt 34° toward the c axis. The ordered moment is 0.66(3) μB/Ir, larger than other iridates where iridium ions form corner- or edge-sharing IrO6 octahedral networks. The tilting angle is reduced to ≈19° when a magnetic field of 4.9 T is applied along the c axis. Density functional theory calculations confirm that the experimentally determined magnetic configuration is the most probable ground state with an insulating gap ~0.5 eV.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4];  [4];  [4]
+ Show Author Affiliations
  1. Renmin Univ. of China, Beijing (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Colorado, Boulder, CO (United States); National High Magnetic Field Lab., Tallahassee, FL (United States)
  4. Univ. of Colorado, Boulder, CO (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1465040
Alternate Identifier(s):
OSTI ID: 1441124
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 23; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Sheng, Jieming, Ye, Feng, Hoffmann, Christina, Cooper, Valentino R., Okamoto, Satoshi, Terzic, Jasminka, Zheng, Hao, Zhao, Hengdi, and Cao, Gang. Anisotropic antiferromagnetic order in the spin-orbit coupled trigonal-lattice Ca2Sr2IrO6. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.235116.
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Sheng, Jieming, Ye, Feng, Hoffmann, Christina, Cooper, Valentino R., Okamoto, Satoshi, Terzic, Jasminka, Zheng, Hao, Zhao, Hengdi, & Cao, Gang. Anisotropic antiferromagnetic order in the spin-orbit coupled trigonal-lattice Ca2Sr2IrO6. United States. https://doi.org/10.1103/PhysRevB.97.235116
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Sheng, Jieming, Ye, Feng, Hoffmann, Christina, Cooper, Valentino R., Okamoto, Satoshi, Terzic, Jasminka, Zheng, Hao, Zhao, Hengdi, and Cao, Gang. Mon . "Anisotropic antiferromagnetic order in the spin-orbit coupled trigonal-lattice Ca2Sr2IrO6". United States. https://doi.org/10.1103/PhysRevB.97.235116. https://www.osti.gov/servlets/purl/1465040.
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@article{osti_1465040,
title = {Anisotropic antiferromagnetic order in the spin-orbit coupled trigonal-lattice Ca2Sr2IrO6},
author = {Sheng, Jieming and Ye, Feng and Hoffmann, Christina and Cooper, Valentino R. and Okamoto, Satoshi and Terzic, Jasminka and Zheng, Hao and Zhao, Hengdi and Cao, Gang},
abstractNote = {Here, we used single-crystal x-ray and neutron diffraction to investigate the crystal and magnetic structures of trigonal lattice iridate Ca2Sr2IrO6. The crystal structure is determined to be R¯3 with two distinct Ir sites. The system exhibits long-range antiferromagnetic order below TN = 13.1 K. The magnetic wave vector is identified as (0,0.5,1) with ferromagnetic coupling along the a axis and antiferromagnetic correlation along the b axis. Spins align dominantly within the basal plane along the [1,2,0] direction and tilt 34° toward the c axis. The ordered moment is 0.66(3) μB/Ir, larger than other iridates where iridium ions form corner- or edge-sharing IrO6 octahedral networks. The tilting angle is reduced to ≈19° when a magnetic field of 4.9 T is applied along the c axis. Density functional theory calculations confirm that the experimentally determined magnetic configuration is the most probable ground state with an insulating gap ~0.5 eV.},
doi = {10.1103/PhysRevB.97.235116},
journal = {Physical Review B},
number = 23,
volume = 97,
place = {United States},
year = {2018},
month = {6}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.97.235116
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Figures / Tables:

FIG. 1 FIG. 1: (a) Crystal structure of Ca2Sr2IrO6 in SG $R\bar{3̄}$ There are two distinct Ir1 and Ir2 sites located at (0,0,0) and (0,0,0.5) with different bonding oxygen environment. The trigonal distortion of IrO6 leads to out-of-plane 88.9 ° and in-plane 91.1° bond angles. The structure is drawn using VESTA software.more » (b) The reciprocal-space image in the $(h,k,l$ = 1) scattering plane at 100 K with data collected from the TOPAZ diffractometer. The nuclear peaks in white stars are forbidden reflections of SG $R\bar{3̄}c$ (c) Temperature dependence of specific heat $C$$p$($T$ ). (d) $T$ dependence of magnetization $M$($T$ ) and inverse magnetic susceptibility 1/$χ$ ($T$ ) in an applied magnetic field of 0.5 T parallel to the $ab$ plane and the $c$ axis in the field-cooling protocol. Solid lines are fits using the Curie-Weiss law above the transition temperature.« less
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