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首页> 外文期刊>Physical review >Spin freezing in the spin-liquid compound FeAl_2O_4
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Spin freezing in the spin-liquid compound FeAl_2O_4

机译：在旋转液体化合物FeAl_2O_4中旋转冻结

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摘要

Spin freezing in the A-site spinel FeAl_2O_4, which is a spin-liquid candidate, is studied using remnant magnetization and nonlinear magnetic susceptibility and isofield cooling and heating protocols. The remnant magnetization behavior of FeAl_2O_4 differs significantly from that of a canonical spin glass, which is also supported by analysis of the nonlinear magnetic susceptibility term X_3(T). Through the power-law analysis of X_3(T), a spin-freezing temperature T_g = 11.4 ± 0.9 K and critical exponent γ = 1.48 ± 0.59 are obtained. A Cole-Cole analysis of magnetic susceptibility shows the presence of broad spin relaxation times in FeAl_2O_4, however, the irreversible dc susceptibility plot discourages an interpretation based on conventional spin-glass features. The magnetization measured using the cooling-and-heating-in-unequal-fields protocol brings more insight into the magnetic nature of this frustrated magnet and reveals unconventional glassy behavior. Combining our results, we arrive at the conclusion that the present sample of FeAl_2O_4 consists of a majority spin-liquid phase with "glassy" regions embedded.
机译：使用残余磁化强度和非线性磁化率以及等温场冷却和加热方案研究了在A位尖晶石FeAl_2O_4中的自旋冻结，这是一种自旋液体候选物。 FeAl_2O_4的残余磁化行为与规范旋转玻璃的显着不同，这也得到了非线性磁化率项X_3（T）的分析的支持。通过X_3（T）的幂律分析，获得了自旋冻结温度T_g = 11.4±0.9 K和临界指数γ= 1.48±0.59。磁化率的Cole-Cole分析显示FeAl_2O_4中存在宽的自旋弛豫时间，但是，不可逆的dc磁化率图不利于基于常规自旋玻璃特征的解释。使用不等温冷却和加热协议测量的磁化强度，可以使人们更深入地了解这种沮丧的磁体的磁性，并揭示出非常规的玻璃态行为。结合我们的结果，我们得出的结论是，目前的FeAl_2O_4样品由具有“玻璃状”区域嵌入的多数自旋液相组成。

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  • 来源
    《Physical review》 |2015年第5期|054423.1-054423.5|共5页
  • 作者

    Harikrishnan S. Nair; Ramesh Kumar K.; Andre M. Strydom;

  • 作者单位

    Highly Correlated Matter Research Group, Physics Department, P. O. Box 524, University of Johannesburg, Auckland Park 2006, South Africa;

    Highly Correlated Matter Research Group, Physics Department, P. O. Box 524, University of Johannesburg, Auckland Park 2006, South Africa;

    Highly Correlated Matter Research Group, Physics Department, P. O. Box 524, University of Johannesburg, Auckland Park 2006, South Africa,Max Planck Institute for Chemical Physics of Solids (MPICPfS), Noethnitzerstrasse 40, 01187 Dresden, Germany;

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  • 关键词

    exchange and superexchange interactions; studies of specific magnetic materials;

    机译：交换和超级交换互动;特殊磁性材料的研究;

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