Coexisting commensurate and incommensurate magnetic orders in the double double perovskite CaMnCoWO<sub>6</sub>

Attfield, J. Paul; Ji, Kunlang; Chen, R.; Manuel, Pascal

doi:10.1002/zaac.202300047

Zeitschrift anorg allge chemie

2023

DOI: 10.1002/zaac.202300047

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Coexisting commensurate and incommensurate magnetic orders in the double double perovskite CaMnCoWO₆

J. Paul Attfield

Kunlang Ji

R. Chen

et al.

Abstract: A new double double perovskite of ideal composition CaMnCoWO6 has been synthesised at high pressure. The structure is tetragonal (P42/n, a=7.6651(3), c=7.6822(3) Å) and disorder between A‐site Mn2+ and B‐site Co2+ leads to a Co‐rich off‐stoichiometric composition CaMn0.8Co1.2WO6 [Ca(Mn0.65Co0.35) (Co0.86Mn0.14)WO6]. An unusual combination of commensurate and incommensurate spin orders (A‐site Mn/Co spins with propagation vector (0.5 0.5 0.5) and B‐site Co/Mn spins with (0.5 0.42 0.5)) is observed below a magne… Show more

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2024

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Cited by 2 publications

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(Ca_0.5Mn_0.5)₂MnTeO₆ – An Anomalously Stable High‐Pressure Double Perovskite

Almadhi,

Ji,

Injac

et al. 2024

Chemistry An Asian Journal

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High pressure high temperature treatments of the composition CaMnMnTeO6 are found to yield only an A2BB’O6‐type double perovskite (Ca0.5Mn0.5)2MnTeO6, rather than a AA’BB’O6 double double perovskite with A‐ and B‐ site cation order as found in analogs CaMnMnReO6 and CaMnMnWO6 with similar cation sizes. Double perovskite (Ca0.5Mn0.5)2MnTeO6 adopts a monoclinic structure in space group P21/n with a framework of highly tilted MnO6 and TeO6 octahedra enclosing disordered Ca2+ and Mn2+ cations. Magnetic measurements show that (Ca0.5Mn0.5)2MnTeO6 is a highly frustrated spin glass with a freezing transition at 5 K, and no long‐range spin order is apparent by neutron diffraction at 1.6 K.

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(Ca_0.5Mn_0.5)₂MnTeO₆ – An Anomalously Stable High‐Pressure Double Perovskite

Almadhi,

Ji,

Injac

et al. 2024

Chemistry An Asian Journal

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Three Perovskite Phases with Different Cation Orders in Sm₂MnMn(Mn_4−xSb_x)O₁₂

Liang,

Yamaura,

Belik

2024

Chemistry A European J

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Cation order, which can be controlled by synthesis conditions and stoichiometry, plays an important role in properties of perovskite materials. Here we show that aliovalent doping by Sb5+ in Sm2MnMn(Mn4−xSbx)O12 quadruple perovskite solid solutions can control cation orders in both A and B sites. Samples with 0.4 ≤ x ≤ 2 were synthesized by a high‐pressure, high‐temperature method at 6 GPa and 1770 K. Three regions with different cation orders were found at 0.5 ≤ x ≤ 1.0, x = 1.5–1.6, and x = 1.8. The 0.5 ≤ x ≤ 1.0 compositions have a B‐site‐disordered and A‐site columnar‐ordered structure with space group P42/nmc; the x = 1.5 and 1.6 samples have a B‐site rock‐salt‐ordered and A‐site columnar‐ordered structure with space group P42/n; the x = 1.8 sample has a B‐site rock‐salt‐ordered and A‐site‐disordered structure with space group P21/n. All the samples show one ferrimagnetic transition: TC increases from 35 K to 73 K for 0.5 ≤ x ≤ 1.0, TC = 81 K for x = 1.5 and 1.6, and TC = 53 K for x = 1.8.

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Coexisting commensurate and incommensurate magnetic orders in the double double perovskite CaMnCoWO₆

Cited by 2 publications

References 35 publications

(Ca_0.5Mn_0.5)₂MnTeO₆ – An Anomalously Stable High‐Pressure Double Perovskite

(Ca_0.5Mn_0.5)₂MnTeO₆ – An Anomalously Stable High‐Pressure Double Perovskite

Three Perovskite Phases with Different Cation Orders in Sm₂MnMn(Mn_4−xSb_x)O₁₂

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Coexisting commensurate and incommensurate magnetic orders in the double double perovskite CaMnCoWO6

Cited by 2 publications

References 35 publications

(Ca0.5Mn0.5)2MnTeO6 – An Anomalously Stable High‐Pressure Double Perovskite

(Ca0.5Mn0.5)2MnTeO6 – An Anomalously Stable High‐Pressure Double Perovskite

Three Perovskite Phases with Different Cation Orders in Sm2MnMn(Mn4−xSbx)O12

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Coexisting commensurate and incommensurate magnetic orders in the double double perovskite CaMnCoWO₆

(Ca_0.5Mn_0.5)₂MnTeO₆ – An Anomalously Stable High‐Pressure Double Perovskite

(Ca_0.5Mn_0.5)₂MnTeO₆ – An Anomalously Stable High‐Pressure Double Perovskite

Three Perovskite Phases with Different Cation Orders in Sm₂MnMn(Mn_4−xSb_x)O₁₂