Magnetic Phase Separation in the Oxypnictide Sr2Cr1.85 Mn1.15As2O2

Bor Arah; Clemens Ritter; Gavin B G Stenning; Abbie C Mclaughlin

doi:10.1021/acs.inorgchem.2c00885

Magnetic Phase Separation in the Oxypnictide Sr₂Cr_1.85Mn_1.15As₂O₂

Bor Arah, Clemens Ritter, Gavin B G Stenning, Abbie C Mclaughlin^* (Corresponding Author)

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Layered Sr 2M 3As 2O 2-type oxypnictides are composed of tetrahedral M 2Pn 2 and square planar MO 2 layers, the building blocks of iron-based and cuprate superconductors. To further expand our understanding of the chemical and magnetic properties of the Sr 2Cr 3- x Mn x As 2O 2 solid solution, Sr 2Cr 2MnAs 2O 2 has been synthesized. The compound crystallizes in the I4/ mmm tetragonal space group with a refined stoichiometry of Sr 2Cr 1.85Mn 1.15As 2O 2. The M(2) site within the M 2Pn 2 slab is occupied by 42.7% Cr and 57.3% Mn, and the magnetic moments order antiferromagnetically below T N(M2) = 540 K with a C-type antiferromagnetic structure. The M(1) site within the MO 2 layers is fully occupied by Cr, and antiferromagnetic order is observed below T N(M1) = 200 K. Along c, there are two possible interplanar arrangements: ferromagnetic with the (1/2, 1/2, 0) propagation vector and antiferromagnetic with the (1/2, 1/2, 1/2) propagation vector. Magnetic phase separation arises so that both propagation vectors are observed below 200 K. Such magnetic phase separation has not been previously observed in Sr 2M 3As 2O 2 phases (M = Cr, Mn) and shows that there are several competing magnetic structures present in these compounds.

Original language	English
Pages (from-to)	12518-12525
Number of pages	8
Journal	Inorganic Chemistry
Volume	61
Issue number	32
Early online date	4 Aug 2022
DOIs	https://doi.org/10.1021/acs.inorgchem.2c00885
Publication status	Published - 15 Aug 2022

Bibliographical note

The authors thank the U.K. Science and Technology Facilities Council (STFC) for provision of neutron beamtime at the ILL under the experiment code 5-31-2665. Data are available from ILL at DOI:10.5291/ILL-DATA.5-31-2665.

Data Availability Statement

CCDC 2163344 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, or by emailing data_request@ccdc.cam.ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336033.

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Cite this

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title = "Magnetic Phase Separation in the Oxypnictide Sr2Cr1.85 Mn1.15As2O2",

abstract = "Layered Sr 2M 3As 2O 2-type oxypnictides are composed of tetrahedral M 2Pn 2 and square planar MO 2 layers, the building blocks of iron-based and cuprate superconductors. To further expand our understanding of the chemical and magnetic properties of the Sr 2Cr 3- x Mn x As 2O 2 solid solution, Sr 2Cr 2MnAs 2O 2 has been synthesized. The compound crystallizes in the I4/ mmm tetragonal space group with a refined stoichiometry of Sr 2Cr 1.85Mn 1.15As 2O 2. The M(2) site within the M 2Pn 2 slab is occupied by 42.7% Cr and 57.3% Mn, and the magnetic moments order antiferromagnetically below T N(M2) = 540 K with a C-type antiferromagnetic structure. The M(1) site within the MO 2 layers is fully occupied by Cr, and antiferromagnetic order is observed below T N(M1) = 200 K. Along c, there are two possible interplanar arrangements: ferromagnetic with the (1/2, 1/2, 0) propagation vector and antiferromagnetic with the (1/2, 1/2, 1/2) propagation vector. Magnetic phase separation arises so that both propagation vectors are observed below 200 K. Such magnetic phase separation has not been previously observed in Sr 2M 3As 2O 2 phases (M = Cr, Mn) and shows that there are several competing magnetic structures present in these compounds. ",

author = "Bor Arah and Clemens Ritter and Stenning, {Gavin B G} and Mclaughlin, {Abbie C}",

note = "The authors thank the U.K. Science and Technology Facilities Council (STFC) for provision of neutron beamtime at the ILL under the experiment code 5-31-2665. Data are available from ILL at DOI:10.5291/ILL-DATA.5-31-2665.",

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AU - Mclaughlin, Abbie C

N1 - The authors thank the U.K. Science and Technology Facilities Council (STFC) for provision of neutron beamtime at the ILL under the experiment code 5-31-2665. Data are available from ILL at DOI:10.5291/ILL-DATA.5-31-2665.

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N2 - Layered Sr 2M 3As 2O 2-type oxypnictides are composed of tetrahedral M 2Pn 2 and square planar MO 2 layers, the building blocks of iron-based and cuprate superconductors. To further expand our understanding of the chemical and magnetic properties of the Sr 2Cr 3- x Mn x As 2O 2 solid solution, Sr 2Cr 2MnAs 2O 2 has been synthesized. The compound crystallizes in the I4/ mmm tetragonal space group with a refined stoichiometry of Sr 2Cr 1.85Mn 1.15As 2O 2. The M(2) site within the M 2Pn 2 slab is occupied by 42.7% Cr and 57.3% Mn, and the magnetic moments order antiferromagnetically below T N(M2) = 540 K with a C-type antiferromagnetic structure. The M(1) site within the MO 2 layers is fully occupied by Cr, and antiferromagnetic order is observed below T N(M1) = 200 K. Along c, there are two possible interplanar arrangements: ferromagnetic with the (1/2, 1/2, 0) propagation vector and antiferromagnetic with the (1/2, 1/2, 1/2) propagation vector. Magnetic phase separation arises so that both propagation vectors are observed below 200 K. Such magnetic phase separation has not been previously observed in Sr 2M 3As 2O 2 phases (M = Cr, Mn) and shows that there are several competing magnetic structures present in these compounds.

AB - Layered Sr 2M 3As 2O 2-type oxypnictides are composed of tetrahedral M 2Pn 2 and square planar MO 2 layers, the building blocks of iron-based and cuprate superconductors. To further expand our understanding of the chemical and magnetic properties of the Sr 2Cr 3- x Mn x As 2O 2 solid solution, Sr 2Cr 2MnAs 2O 2 has been synthesized. The compound crystallizes in the I4/ mmm tetragonal space group with a refined stoichiometry of Sr 2Cr 1.85Mn 1.15As 2O 2. The M(2) site within the M 2Pn 2 slab is occupied by 42.7% Cr and 57.3% Mn, and the magnetic moments order antiferromagnetically below T N(M2) = 540 K with a C-type antiferromagnetic structure. The M(1) site within the MO 2 layers is fully occupied by Cr, and antiferromagnetic order is observed below T N(M1) = 200 K. Along c, there are two possible interplanar arrangements: ferromagnetic with the (1/2, 1/2, 0) propagation vector and antiferromagnetic with the (1/2, 1/2, 1/2) propagation vector. Magnetic phase separation arises so that both propagation vectors are observed below 200 K. Such magnetic phase separation has not been previously observed in Sr 2M 3As 2O 2 phases (M = Cr, Mn) and shows that there are several competing magnetic structures present in these compounds.

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Magnetic Phase Separation in the Oxypnictide Sr2Cr1.85 Mn1.15As2O2