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Phase transitions in Sr_2YRuO_6 investigated by Moessbauer spectroscopy, magnetization, and thermodynamic measurements

机译：通过Moessbauer光谱，磁化和热力学测量研究Sr_2YRuO_6中的相变

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摘要

Recent specific-heat data measured in Sr_2YRuO_6 have revealed two transition features at ～26 and ～30 K, where only one transition could be inferred before from magnetic susceptibility and transport measurements. We have investigated this temperature region using ~(99)Ru Moessbauer spectroscopy, magnetization, and thermodynamic measurements in order to elucidate the unusual properties in this temperature region. Below 25 K, fits to the Mossbauer spectra show that there is a unique value of the hyperfine magnetic field at each Ru site indicating static long-range magnetic order. Beyond 25 K, this static long-range magnetic order rapidly deteriorates. We have found that the temperature dependence of the Mossbauer spectra between ～25 and ～28 K can be described as due to either motional narrowing or to a temperature-dependent distribution of hyperfine magnetic fields. The Mossbauer spectra collapse to a single peak in this narrow temperature interval so that there is no evidence of static magnetic order by ～30 K. As a result, no evidence of the transition at 30 K is seen in the Mossbauer spectra.
机译：最近在Sr_2YRuO_6中测得的比热数据揭示了在〜26和〜30 K处的两个跃迁特征，从磁化率和迁移率测量中只能推断出一个跃迁。我们使用〜（99）Ru Moessbauer光谱，磁化强度和热力学测量方法研究了该温度区域，以阐明该温度区域中的异常特性。在25 K以下，对Mossbauer光谱的拟合表明，在每个Ru位置都有一个超细磁场的唯一值，指示静态长距离磁阶。超过25 K时，此静态远程磁阶会迅速恶化。我们已经发现，Mossbauer光谱在约25 K〜约28 K之间的温度依赖性可以描述为是由于运动变窄或超精细磁场的温度依赖性分布。 Mossbauer光谱在此狭窄的温度区间内崩溃为一个峰，因此在30 K左右没有静磁序的迹象。结果，在Mossbauer光谱中没有看到30 K跃迁的迹象。

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  • 来源
    《Physical review》 |2013年第2期|024416.1-024416.8|共8页
  • 作者

    G. Long; M. DeMarco; D. Coffey; M. K. Toth; M. S. Torikachvili;

  • 作者单位

    Department of Physics, State University of New York at Buffalo, Buffalo, New York 14260, USA;

    Department of Physics, State University of New York at Buffalo, Buffalo, New York 14260, USA,Department of Physics, Buffalo State College, Buffalo, New York 14222, USA;

    Department of Physics, Buffalo State College, Buffalo, New York 14222, USA;

    Department of Physics, San Diego State University, San Diego, California 92182, USA;

    Department of Physics, San Diego State University, San Diego, California 92182, USA;

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  • 正文语种 eng
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  • 关键词

    moesbauer effect; other gamma-ray spectroscopy; antiferromagnetics; ruthenates;

    机译：莫斯鲍尔效应其他γ射线光谱学;反铁磁钌酸;

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