Coexisting commensurate and incommensurate magnetic orders in the double double perovskite CaMnCoWO 6

Coexisting commensurate and incommensurate magnetic orders in the double double perovskite CaMnCoWO 6
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双双钙钛矿 CaMnCoWO 6 中共存的相称和不相称磁序

DOI:
10.1002/zaac.202300047
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发表时间:
2023
期刊:
Zeitschrift für anorganische und allgemeine Chemie
影响因子:
--
通讯作者:
Ji K
Ji K
中科院分区:
--
文献类型:
--
作者:
Ji K

文献摘要

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在高压下合成了一种新的具有理想组成的双双钙钛矿结构的CaMnCoWO_6。其结构为四配位(P42/n,a=7.6651(3),c=7.6822(3)),A位Mn 2+和B位Co 2+之间的无序导致富含Co的非化学计量组成CaMn 0.8Co 1.2WO 6 [Ca(Mn 0.65Co 0.35)(Co 0.86Mn 0.14)WO 6]。在TC =18 K的磁转变下观察到一种不寻常的公度和非公度自旋序的组合(A位Mn/Co自旋的传播矢量为(0.5 0.5 0.5),B位Co/Mn自旋的传播矢量为(0.5 0.42 0.5))。 这是在双双钙钛矿家族中首次发现复合磁性。
A new double double perovskite of ideal composition CaMnCoWO6has 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 magnetic transition atTC=18 K. This is the first discovery of complex magnetism in the double double perovskite family.