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Title: Neutron diffraction study on magnetic structures and transitions in Sr 2 Cr 3 As 2 O 2

Sr 2Cr 3As 2O 2 is composed of alternating square-lattice CrO 2 and Cr 2As 2 stacking layers, where CrO 2 is isostructural to the CuO 2 building-block of cuprate high- T c superconductors and Cr 2As 2 to Fe 2As 2 of Fe-based superconductors. Current interest in this material is raised by theoretic prediction of possible superconductivity. In this neutron powder diffraction study, we discovered that magnetic moments of Cr(II) ions in the Cr 2As 2 sublattice develop a C-type antiferromagnetic structure below 590 K, and the moments of Cr(I) in the CrO 2 sublattice form the La 2CuO 4-like antiferromagnetic order below 291 K. The staggered magnetic moment 2.19(4)μ B/Cr(II) in the more itinerant Cr 2As 2 layer is smaller than 3.10(6)μ B/Cr(I) in the more localized CrO 2 layer. Furthermore, different from previous expectations, a spin-flop transition of the Cr(II) magnetic order observed at 291 K indicates a strong coupling between the CrO 2 and Cr 2As 2 magnetic subsystems.
Authors:
 [1] ;  [1] ;  [2] ; ORCiD logo [3] ; ORCiD logo [3] ; ORCiD logo [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [6] ;  [1]
  1. Renmin Univ. of China, Beijing (China)
  2. Renmin Univ. of China, Beijing (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. China Academy of Engineering Physics, Mianyang (China); Renmin Univ. of China, Beijing (China)
  5. China Academy of Engineering Physics, Mianyang (China)
  6. Zhejiang Univ., Hangzhou (China)
  7. Xiangtan Univ., Xiangtan (China)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 13; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1479776
Alternate Identifier(s):
OSTI ID: 1477562

Liu, Juanjuan, Wang, Jinchen, Sheng, Jieming, Ye, Feng, Taddei, Keith M., Fernandez-Baca, Jamie A., Luo, Wei, Sun, Guang -Ai, Wang, Zhi -Cheng, Jiang, Hao, Cao, Guang -Han, and Bao, Wei. Neutron diffraction study on magnetic structures and transitions in Sr2Cr3As2O2. United States: N. p., Web. doi:10.1103/PhysRevB.98.134416.
Liu, Juanjuan, Wang, Jinchen, Sheng, Jieming, Ye, Feng, Taddei, Keith M., Fernandez-Baca, Jamie A., Luo, Wei, Sun, Guang -Ai, Wang, Zhi -Cheng, Jiang, Hao, Cao, Guang -Han, & Bao, Wei. Neutron diffraction study on magnetic structures and transitions in Sr2Cr3As2O2. United States. doi:10.1103/PhysRevB.98.134416.
Liu, Juanjuan, Wang, Jinchen, Sheng, Jieming, Ye, Feng, Taddei, Keith M., Fernandez-Baca, Jamie A., Luo, Wei, Sun, Guang -Ai, Wang, Zhi -Cheng, Jiang, Hao, Cao, Guang -Han, and Bao, Wei. 2018. "Neutron diffraction study on magnetic structures and transitions in Sr2Cr3As2O2". United States. doi:10.1103/PhysRevB.98.134416.
@article{osti_1479776,
title = {Neutron diffraction study on magnetic structures and transitions in Sr2Cr3As2O2},
author = {Liu, Juanjuan and Wang, Jinchen and Sheng, Jieming and Ye, Feng and Taddei, Keith M. and Fernandez-Baca, Jamie A. and Luo, Wei and Sun, Guang -Ai and Wang, Zhi -Cheng and Jiang, Hao and Cao, Guang -Han and Bao, Wei},
abstractNote = {Sr2Cr3As2O2 is composed of alternating square-lattice CrO2 and Cr2As2 stacking layers, where CrO2 is isostructural to the CuO2 building-block of cuprate high-Tc superconductors and Cr2As2 to Fe2As2 of Fe-based superconductors. Current interest in this material is raised by theoretic prediction of possible superconductivity. In this neutron powder diffraction study, we discovered that magnetic moments of Cr(II) ions in the Cr2As2 sublattice develop a C-type antiferromagnetic structure below 590 K, and the moments of Cr(I) in the CrO2 sublattice form the La2CuO4-like antiferromagnetic order below 291 K. The staggered magnetic moment 2.19(4)μB/Cr(II) in the more itinerant Cr2As2 layer is smaller than 3.10(6)μB/Cr(I) in the more localized CrO2 layer. Furthermore, different from previous expectations, a spin-flop transition of the Cr(II) magnetic order observed at 291 K indicates a strong coupling between the CrO2 and Cr2As2 magnetic subsystems.},
doi = {10.1103/PhysRevB.98.134416},
journal = {Physical Review B},
number = 13,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

Works referenced in this record:

A profile refinement method for nuclear and magnetic structures
journal, June 1969