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首页> 外文期刊>Physical review >Coexistence of antiferromagnetic ordering and superconductivity in the Ba(Fe_(0.961)Rh_(0.039))_2As_2 compound studied by Moessbauer spectroscopy
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Coexistence of antiferromagnetic ordering and superconductivity in the Ba(Fe_(0.961)Rh_(0.039))_2As_2 compound studied by Moessbauer spectroscopy

机译:Moessbauer光谱研究Ba(Fe_(0.961)Rh_(0.039))_ 2As_2化合物中反铁磁有序和超导性的共存

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摘要

The results of a 57Fe Mossbauer spectroscopy study between 2.0 and 294 K of superconducting Ba(Fe_(0.961)Rh_(0.039))_2As_2 are reported. The main component of the electric field gradient tensor at 294 K is shown to be positive and its increase with decreasing temperature is well described by a T~(3/2) power-law relation. The shape of the Mossbauer spectra below the Neel temperature T_N = 55.5(1) K is shown to result from the presence of doping-induced disorder rather than of incommensurate spin-density-wave order. The measured hyperflne magnetic field reaches its maximum value at the critical temperature T_C = 14 K and then decreases by 4.2% upon further cooling to 2.0 K. This constitutes direct evidence of the coexistence of and competition between superconductivity and magnetic order. The extrapolated value of the Fe magnetic moment at 0 K is determined to be 0.35(1) μB. The Debye temperature of Ba(Fe_(0.961)Rh_(0.039))_2As_2 is found to be 357(3) K.
机译:报告了超导Ba(Fe_(0.961)Rh_(0.039))_ 2As_2在2.0和294 K之间的57Fe Mossbauer光谱研究的结果。电场梯度张量的主要成分在294 K处显示为正,其随温度降低的增加可以通过T〜(3/2)幂律关系很好地描述。低于Neel温度T_N = 55.5(1)K的Mossbauer光谱的形状显示是由于掺杂引起的无序现象而不是自旋密度波阶不相称。在临界温度T_C = 14 K时,测得的超磁场磁场达到最大值,然后在进一步冷却至2.0 K时下降4.2%。这直接证明了超导性和磁序的共存和竞争。 Fe磁矩在0 K处的外推值确定为0.35(1)μB。发现Ba(Fe_(0.961)Rh_(0.039))_ 2As_2的德拜温度为357(3)K.

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  • 来源
    《Physical review》 |2011年第2期|p.024509.1-024509.8|共8页
  • 作者单位

    Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada;

    Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada;

    Solid State Physics Department, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology,PL-30-059 Krakow, Poland;

    Ames Laboratory, US Department of Energy, and Department of Physics and Astronomy, Iowa State University,Ames, Iowa 50011, USA;

    Ames Laboratory, US Department of Energy, and Department of Physics and Astronomy, Iowa State University,Ames, Iowa 50011, USA;

    Ames Laboratory, US Department of Energy, and Department of Physics and Astronomy, Iowa State University,Ames, Iowa 50011, USA;

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  • 正文语种 eng
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  • 关键词

    superconducting materials; moesbauer effect; other gamma-ray spectroscopy;

    机译:超导材料;莫斯鲍尔效应其他伽玛射线光谱;

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