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

Abstract

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:
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)
OSTI Identifier:
1479776
Alternate Identifier(s):
OSTI ID: 1477562
Grant/Contract Number:  
AC05-00OR22725
Resource 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)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

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., 2018. 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. Wed . "Neutron diffraction study on magnetic structures and transitions in Sr2Cr3As2O2". United States. doi:10.1103/PhysRevB.98.134416. https://www.osti.gov/servlets/purl/1479776.
@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}
}

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Figures / Tables:

FIG. 1 FIG. 1: (a) Crystal structure of Sr2Cr3As2O2. The atoms are noted by different colors. Layers of CrO2 squares and Cr2As2 tetrahedra are labeled. (b) The magnetic structure below 291 K when both CrO2 layer and Cr2As2 layer order. (c) The magnetic structure above 291 K when only the Cr2As2 layermore » orders. The solid lines in (b) and (c) are the structural unit cell identical to the cell in (a), and the dash lines in (b) are the magnetic unit cell with $a$mag = $a$+$b$, $b$mag = $a$ −$b$.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.