Neutron diffraction study on magnetic structures and transitions in Sr2Cr3As2O2

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-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)μ B /Cr(II) in the more itinerant Cr2As2 layer is smaller than 3.10(6)μ_B/Cr(I) in the more localized CrO2 layer. Different from previous expectation, 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.

7pages, 4 figures, 2 tables

References in corpus (21)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Gap symmetry and structure of Fe-based superconductors
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
• Anion height dependence of Tc for the Fe-based superconductor
• Structure and Magnetic Order in the NdFeAs(O,F) Superconductor System
• Chemistry of layered d-metal pnictide oxides and their potential as candidates for new superconductors
• Itinerant antiferromagnetism in BaCr${}_2$As${}_2$
• Spin Dynamics in an Ordered Stripe Phase
• Antiferromagnetic structure and electronic properties of BaCr2As2 and BaCrFeAs2
• Synthesis, Structure and Properties of Tetragonal Sr2M3As2O2 (M3 = Mn3, Mn2Cu and MnZn2) Compounds Containing Alternating CuO2-Type and FeAs-Type Layers
• Physical properties and electronic structure of Sr${}_2$Cr${}_3$As${}_2$O${}_2$ containing CrO${}_2$ and Cr${}_2$As${}_2$ square-planar lattices
• Chromium analogues of Iron-based superconductors
• Strong correlations and the search for high-Tc superconductivity in chromium pnictides and chalcogenides
• Itinerant G-type antiferromagnetic order in SrCr${}_2$As${}_2$
• Possible Superconductivity in Electron-doped Chromium Pnictide LaOCrAs
• Synthesis of New Layered Oxypnictides Sr2CrO2(FeAs)2
• Physics picture from neutron scattering study on Fe-based superconductors
• Crystal chemical simulation of superconductors on the basis of oxide and intermetallic layers
• Hybrid Crystals of Cuprates and Iron-Based Superconductors

Cited by in corpus (2)

• Absence of superconductivity in electron-doped chromium pnictides ThCrAsN${}_{1-x}$O${}_x$
• Quasi-two-dimensional heterostructures (K$M_{1-x}$Te)(LaTe${}_3$) ($M$ = Mn, Zn) with charge density waves