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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Effects of magnetic dilution in the ferrimagnetic columnar ordered Sm_2MnMnMn_(4-x)Ti_xO_(12) perovskites
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Effects of magnetic dilution in the ferrimagnetic columnar ordered Sm_2MnMnMn_(4-x)Ti_xO_(12) perovskites

机译：磁性稀释在铁磁性柱状柱上有序SM_2MNMNMN_（4-X）TI_XO_（12）PEROVSKITE中的影响

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摘要

Powder neutron-diffraction experiments have been employed to establish the effects of site-selective magnetic dilution in the Sm_2MnMn_(4-x)Ti_xO_(12) A-site columnar ordered quadruple perovskite manganites (x = 1,x = 2, and x = 3). We show that in all three compositions the Mn ions adopt a collinear ferrimagnetic structure below 27. 62, and 34 K. respectively. An unexpected increase in the ordering temperature was observed between the x = 1 and x = 2 samples, which indicates a considerable departure from mean-field behavior. This result is corroborated by large reductions in the theoretical ground-state magnetic moments observed across the series, which indicate the presence of spin fluctuations and/or disorder. We show that long-range magnetic order in the x = 3 sample, which occurs below the percolation threshold for B-B exchange, can only be understood to arise if it is mediated via both A-B and B-B exchange, hence confirming the importance of A-B exchange interactions in these materials. Finally, we show that site-selective magnetic dilution enables the tuning of a ferrimagnetic compensation point and the introduction of temperature-induced magnetization reversal.
机译：已经采用粉末中子 - 衍射实验在SM_2MNMN_（4-X）TI_XO_（12）A-PATIBAR有序的四元钙钛矿锰（x = 1，x = 2）中建立位点选择性磁稀释的影响（x = 1，x = 2，x = 3）。我们表明，在所有三种组合物中，Mn离子分别在27.62和34K以下采用共线亚铁磁性结构。在X = 1和x = 2个样品之间观察到有意增加的顺序增加，这表明从平均场行为相当偏离。通过在跨越系列中观察到的理论地面磁性矩的大量减少，该结果是通过较大的减少，这表明存在旋转波动和/或病症的存在。我们表明，如果通过AB和BB交换介导，只能理解，如果通过AB和BB交换介导的话，可以理解，X = 3样品中发生的远程磁场。因此，只能理解为出现通过AB和BB交换的介导。因此确认了AB兑换相互作用的重要性在这些材料中。最后，我们表明场地选择性磁稀释能够调谐亚铁磁性补偿点和温度诱导的磁化反转的引入。

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  • 来源
    《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214428.1-214428.10|共10页
  • 作者

    Anuradha M. Vibhakar; Dmitry D. Khalyavin; Pascal Manuel; Ran Liu; Kazunari Yamaura; Alexei A. Belik; Roger D. Johnson;

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    Clarendon Laboratory Department of Physics University of Oxford Oxford OX1 3PU United Kingdom Department of Physics and Astronomy University College London Gower Street London WC1E 6BT United Kingdom;

    ISIS Facility Rutherford Appleton Laboratory-STFC Chilton Didcot OX11 0QX United Kingdom;

    ISIS Facility Rutherford Appleton Laboratory-STFC Chilton Didcot OX11 0QX United Kingdom;

    International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science (NIMS) Namiki 1-1 Tsukuba Ibaraki 305-0044 Japan Graduate School of Chemical Sciences and Engineering Hokkaido University North 10 West 8 Kita-ku Sapporo Hokkaido 060-0810 Japan;

    International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science (NIMS) Namiki 1-1 Tsukuba Ibaraki 305-0044 Japan Graduate School of Chemical Sciences and Engineering Hokkaido University North 10 West 8 Kita-ku Sapporo Hokkaido 060-0810 Japan;

    International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science (NIMS) Namiki 1-1 Tsukuba Ibaraki 305-0044 Japan;

    Clarendon Laboratory Department of Physics University of Oxford Oxford OX1 3PU United Kingdom Department of Physics and Astronomy University College London Gower Street London WC1E 6BT United Kingdom;

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