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首页> 外文期刊>Physical review >Magnetic polaron percolation on a rutile lattice: A geometrical exploration in the limit of low density of magnetic impurities
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Magnetic polaron percolation on a rutile lattice: A geometrical exploration in the limit of low density of magnetic impurities

机译：金红石晶格上的磁极化子渗滤：低磁性杂质密度极限的几何探索

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摘要

The evolution of magnetic polaron clusters on a rutile lattice has been explored, and the results are used to discuss the origin of ferromagnetism in transition-metal (TM)-doped rutile TiO_2 oxides. It is shown that percolation on a rutile lattice is characterized by a threshold different from that found for the percolation of randomly distributed spheres, which has been so far assumed as a model to treat the percolation of magnetic polarons in diluted magnetic semiconductors. Furthermore, unlike previous investigations, we explicitly considered the condition of small density n_i of TM impurities, i.e., a regime that is quite far from that usually regarded for polaron formation, dominated by a high density n_i of TM ions. Assuming that ferromagnetic coupling arises between polarons that share common TM impurities, we show the effect of this constraint on the magnetic properties of the sample compared to those reported for the n_i n_h regime.
机译：研究了金红石晶格上磁极化子簇的演化，并将其结果用于讨论掺杂过渡金属（TM）的金红石TiO_2氧化物中铁磁性的起源。结果表明，金红石晶格上的渗滤具有不同于随机分布球体渗滤的阈值，迄今为止，该阈值已被认为是处理稀磁半导体中磁极化子渗滤的模型。此外，与以前的研究不同，我们明确考虑了TM杂质的小密度n_i的条件，即，与通常认为的极化子形成相差很远的一种状态，以TM离子的高密度n_i为主。假设在共享常见TM杂质的极化子之间出现铁磁耦合，与对n_i n_h谱系报道的磁性能相比，我们显示了该约束对样品磁性能的影响。

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  • 来源
    《Physical review》 |2009年第3期|033201.1-033201.4|共4页
  • 作者

    L. Sangaletti; F. Federici Canova; G. Drera; G. Salvinelli; M. C. Mozzati; P. Galinetto; A. Speghini; M. Bettinelli;

  • 作者单位

    Dipartimento di Matematica e Fisica, Universita Cattolica, via dei Musei 41, 25121 Brescia, Italy;

    Dipartimento di Matematica e Fisica, Universita Cattolica, via dei Musei 41, 25121 Brescia, Italy;

    Dipartimento di Matematica e Fisica, Universita Cattolica, via dei Musei 41, 25121 Brescia, Italy;

    Dipartimento di Matematica e Fisica, Universita Cattolica, via dei Musei 41, 25121 Brescia, Italy;

    Dipartimento di Fisica A. Volta, Universita di Pavia, 27100, Pavia, Italy;

    Dipartimento di Fisica A. Volta, Universita di Pavia, 27100, Pavia, Italy;

    DiSTeMeV, Universita di Verona, via della Pieve 70, San Floriano, 37029 Verona, Italy;

    Dipartimento Scientifico e Tecnologico, Universita di Verona, Strada Le Grazie 15, 37134 Verona, Italy;

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  • 关键词

    magnetic semiconductors; general theory and models of magnetic ordering; nonmetallic ferromagnetic materials;

    机译：磁性半导体电磁订购的一般理论和模型;非金属铁磁材料;

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