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Two-dimensional magnetic interactions in LaFeAsO

机译:LaFeAsO中的二维磁相互作用

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摘要

Inelastic neutron scattering measurements demonstrate that the magnetic interactions in antiferromagnetic LaFeAsO are two dimensional. Spin-wave velocities within the Fe layer and the magnitude of the spin gap are similar to the AFe_2As_2 based materials. However, the ratio of interlayer and intralayer exchange is found to be less than ~10~(-4) in LaFeAsO, very similar to the cuprates, and ~100 times smaller than that found in AFe_2As_2 compounds. The results suggest that the effective dimensionality of the magnetic system is highly variable in the parent compounds of the iron arsenides and weak three-dimensional interactions may limit the maximum attainable superconducting T_c.
机译:非弹性中子散射测量结果表明,反铁磁LaFeAsO中的磁性相互作用是二维的。 Fe层中的自旋波速度和自旋间隙的大小与AFe_2As_2基材料相似。然而,在LaFeAsO中发现层间和层内交换的比率小于〜10〜(-4),与铜酸盐非常相似,并且比在AFe_2As_2化合物中小〜100倍。结果表明,在砷化铁的母体化合物中,磁系统的有效维数变化很大,弱的三维相互作用可能会限制可达到的最大超导T_c。

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  • 来源
    《Physical review》 |2013年第14期|140509.1-140509.5|共5页
  • 作者单位

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

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

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

    Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon 0X11 OQX, United Kingdom;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon 0X11 OQX, United Kingdom;

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

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

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

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

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

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