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首页> 外文期刊>Physical review >Local magnetic inhomogeneities in Ba(Fe_(1-x)Ni_x)_2As_2 as seen via ~(75)As NMR
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Local magnetic inhomogeneities in Ba(Fe_(1-x)Ni_x)_2As_2 as seen via ~(75)As NMR

机译:〜(75)As NMR观察Ba(Fe_(1-x)Ni_x)_2As_2中的局部磁不均匀性

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摘要

We report ~(75)As NMR measurements in BaFe_2As_2 doped with Ni. Like Co, Ni doping suppresses the antiferromagnetic and structural phase transitions and gives rise to superconductivity for sufficiently large Ni doping. The spin-lattice relaxation rate diverges at T_N with a critical exponent consistent with three-dimensional ordering of local moments. In the ordered state the spectra quickly broaden inhomogeneously with doping. We extract the average size of the ordered moment as a function of doping and show that a model in which the order remains commensurate but with local amplitude variations in the vicinity of the dopant fully explains our observations.
机译:我们报道了在掺Ni的BaFe_2As_2中〜(75)As的NMR测量。与Co一样,Ni掺杂抑制了反铁磁和结构相变,并为足够大的Ni掺杂产生了超导性。自旋晶格弛豫速率在T_N处发散,其临界指数与局部矩的三维排序一致。在有序状态下,光谱随掺杂迅速不均匀地扩宽。我们提取了有序矩的平均大小作为掺杂的函数,并显示了其中阶数保持相称但掺杂物附近局部振幅变化的模型,这充分说明了我们的观察结果。

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  • 来源
    《Physical review》 |2010年第14期|p.140411.1-140411.4|共4页
  • 作者单位

    Department of Physics, University of California, Davis, California 95616, USA;

    Department of Physics, University of California, Davis, California 95616, USA;

    Department of Physics, University of California, Davis, California 95616, USA;

    Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

    Department of Physics, University of California, Davis, California 95616, USA;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    antiferromagnetics; valence fluctuation; kondo lattice; and heavy-fermion phenomena; quadrupole resonance;

    机译:反铁磁价波动;近藤格子和重费米子现象;四极共振;

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