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The Origin of Magnetism in Mn-Doped SrTiO_3

机译：Mn掺杂SrTiO_3的磁性起源

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摘要

An analysis of Mn substitution in SrTiO_3 is performed in order to understand the origin of reported spin coupling in lightly Mn-doped SrTiO_3. The spin glass state magnetoelectrically coupled to the dipolar glass state has previously been reported for SrTiO_3 substituted with only 2% of Mn on the B-site. An analysis of the substitution mechanism for A- and B-site doping shows a strong influence of processing conditions, such as processing temperature, oxygen partial pressure, and oflF-stoichiometry. The required conditions for a site-selective substitution are defined, which yield a single-phase and almost defect-free perovskite. Magnetic measurements show no magnetic anomalies resulting from spin coupling and only a simple paramagnetic behavior. Magnetic anomalies are observed only for the samples in which Mn is misplaced within the cation sublattice of the SrTiO_3 perovskite. This occurs due to improper material processing, which causes initially unpredicted changes in the valence state of the Mn and results in the formation of structural defects and irregularities associated with segregation and nucleation of the magnetic species. Previously reported spin coupling in Mn-doped SrTiO_3 is not an intrinsic phenomenon and cannot be treated as a spin glass.
机译：为了了解所报道的轻掺杂Mn的SrTiO_3中自旋耦合的起源，进行了SrTiO_3中Mn取代的分析。先前已经报道了磁电耦合至偶极玻璃态的自旋玻璃态对于SrTiO_3的B位仅被2％的Mn取代。对A和B位置掺杂的取代机理的分析表明，工艺条件（例如工艺温度，氧分压和IF化学计量）的影响很大。确定了位点选择性取代的必要条件，该条件可产生单相且几乎无缺陷的钙钛矿。磁测量结果表明，没有自旋耦合引起的磁异常，只有简单的顺磁行为。仅在Mn在SrTiO_3钙钛矿的阳离子亚晶格内错位的样品中观察到磁异常。这是由于材料处理不当而引起的，该过程最初会导致Mn价态的意外变化，并导致形成结构缺陷和与磁性物质的偏析和成核有关的不规则性。先前报道的Mn掺杂SrTiO_3中的自旋耦合不是固有现象，因此不能视为自旋玻璃。

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  • 来源
    《Advanced Functional Materials》 |2012年第10期|p.2114-2122|共9页
  • 作者

    Matjaz Valant; Tarns Kolodiazhnyi; Iztok Arcon; Frederic Aguesse; Anna-Karin Axelsson; Neil M. Alford;

  • 作者单位

    University of Nova Gorica Vipavska 13, Nova Corica, SI-5000, Slovenia;

    National Institute for Materials Science 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan;

    University of Nova Gorica Vipavska 13, Nova Corica, SI-5000, Slovenia Institut Jozef Stefan Jamova 39, Ljubljana, SI-1000, Slovenia;

    Imperial College London South Kensington Campus, London, SW7 2AZ, UK;

    Imperial College London South Kensington Campus, London, SW7 2AZ, UK;

    Imperial College London South Kensington Campus, London, SW7 2AZ, UK;

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