Neutron diffraction study on magnetic structures and transitions in Sr2Cr3As2O2

2018/06/12 by Juanjuan Liu, Jinchen Wang, Jieming Sheng +13
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Iron-based superconductors research #Isostructural #Magnetic and transport properties of perovskites and related materials #Magnetic moment #Materials science #Neutron diffraction #Order (exchange) #Physics #Superconductivity #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.98.134416

published as Phys. Rev. B 98, 134416 (2018) · 7pages, 4 figures, 2 tables

arxiv created 2018/06/12 · openalex created_date 2018/06/21 · openalex publication_date 2018/10/10 · arxiv updated 2018/10/22 · openalex updated_date 2026/08/05

Abstract

Sr₂Cr₃As₂O₂ is composed of alternating square-lattice CrO₂ and Cr₂As₂ stacking layers, where CrO₂ is isostructural to the CuO₂ building-block of cuprate high-T_c 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)\phantom\rule0.16em0ex\ensuremathμ_B/Cr(II) in the more itinerant Cr₂As₂ layer is smaller than 3.10(6)\phantom\rule0.16em0ex\ensuremathμ_B/Cr(I) in the more localized CrO₂ layer. 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.

Citations

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