Electronic and Magnetic Properties of Cation Ordered Sr2Mn2.23Cr0.77As2O2

被引：5

作者：

Lawrence, Gaynor B. ^{[1
,2
]}

Wildman, Eve J. ^{[1
]}

Stenning, Gavin B. G. ^{[3
]}

Ritter, Clemens ^{[2
]}

Fauth, Francois ^{[4
]}

Mclaughlin, Abbie C. ^{[1
]}

机构：

[1] Univ Aberdeen, Chem Dept, Aberdeen AB24 3UE, Scotland

[2] Inst Laue Langevin, F-38000 Grenoble, France

[3] Rutherford Appleton Lab, Sci & Technol Facil Council, ISIS, Didcot OX11 0QX, Oxon, England

[4] CELLS ALBA Synchrotron, E-08290 Barcelona, Spain

来源：

INORGANIC CHEMISTRY | 2020年 / 59卷 / 11期

基金：

英国工程与自然科学研究理事会;

关键词：

COLOSSAL MAGNETORESISTANCE; BA;

D O I：

10.1021/acs.inorgchem.0c00447

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Several different mechanisms of magnetoresistance (MR) have been observed in 1111 LnMnAsO(1-x)F(x) oxypnictides (Ln = lanthanide) as a result of magnetic coupling between the Mn and Ln. Such phases also exhibit interesting magnetic phase transitions upon cooling. Sr2Mn2CrAs2O2 has been synthesized to investigate if it is possible to observe MR and/or magnetic phase transitions as a result of magnetic coupling between the Mn and Cr. Sr2Mn2CrAs2O2 crystallizes in the tetragonal space group I4/mmm containing alternating MO22- and M'As-2(2)2- layers, and neutron diffraction results demonstrate that the actual stoichiometry is Sr2Mn2.23Cr0.77As2O2. Cation order is present between Mn and Cr, with Cr predominantly occupying the square planar MO22- site. Below 410 K, the magnetic moments of the Mn/Cr ions in the M'As-2(2)2- sublattice exhibit G-type antiferromagnetic order. The Mn/Cr moments within the MO22- layer order below 167 K with a K2NiF4-type antiferromagnetic structure that simultaneously induces a spin flip of the magnetic moments in the M'As-2(2)2- layers from a G-type to a C-type antiferromagnetic arrangement. The results demonstrate that the superexchange interactions are finely balanced in Sr2Mn2.23Cr0.77As2O2. Sr2Mn2.23Cr0.77As2O2 is semiconducting, and there is no evidence of MR.

引用

页码：7553 / 7560

页数：8

共 30 条

[1] OXIDPNICTIDES - PREPARATION AND CRYSTAL-STRUCTURE OF A2MN3B2O2 WITH A = SR, BA AND B = AS, SB, BI [J].

BRECHTEL, E ;

CORDIER, G ;

SCHAFER, H .

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, 1979, 34 (06) :777-780

[2] Structure-property relationships in a series of mixed layer pnictide oxide compounds: A(2)Mn(3)Pn(2)O(2) (A=Sr, Ba; Pn=P, As, Sb) [J].

Brock, SL ;

Kauzlarich, SM .

JOURNAL OF ALLOYS AND COMPOUNDS, 1996, 241 (1-2) :82-88

[3] The magnetic structures of the mixed layer pnictide oxide compounds Sr(2)Mn(3)Pn(2)O(2) (Pn=As, Sb) [J].

Brock, SL ;

Raju, NP ;

Greedan, JE ;

Kauzlarich, SM .

JOURNAL OF ALLOYS AND COMPOUNDS, 1996, 237 (1-2) :9-19

[4] Colossal magnetoresistant materials: The key role of phase separation [J].

Dagotto, E ;

Hotta, T ;

Moreo, A .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 344 (1-3) :1-153

[5] Variable temperature study of the crystal and magnetic structures of the giant magnetoresistant materials LMnAsO (L=La, Nd) [J].

Emery, N. ;

Wildman, E. J. ;

Skakle, J. M. S. ;

Mclaughlin, A. C. ;

Smith, R. I. ;

Fitch, A. N. .

PHYSICAL REVIEW B, 2011, 83 (14)

[6] The crystallography stations at the Alba synchrotron [J].

Fauth, Francois ;

Boer, Roeland ;

Gil-Ortiz, Fernando ;

Popescu, Catalin ;

Vallcorba, Oriol ;

Peral, Inma ;

Fulla, Daniel ;

Benach, Jordi ;

Juanhuix, Jordi .

EUROPEAN PHYSICAL JOURNAL PLUS, 2015, 130 (08)

[7] Long range electronic phase separation in CaFe3O5 [J].

Hong, Ka. H. ;

Arevalo-Lopez, Angel M. ;

Cumby, James ;

Ritter, Clemens ;

Attfield, J. Paul .

NATURE COMMUNICATIONS, 2018, 9

[8]

Jiang H., 2015, Phys. Rev. B, V92

[9] Iron-based layered superconductor La[O1-xFx]FeAs (x=0.05-0.12) with Tc=26 K [J].

Kamihara, Yoichi ;

Watanabe, Takumi ;

Hirano, Masahiro ;

Hosono, Hideo .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2008, 130 (11) :3296-+

[10]

Liu J., 2018, PHYS REV B, V98

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