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首页> 外文期刊>Physical review >Magneto-optical study of Ba(Fe_(1-x)M_x)_2As_2 (M=Co and Ni) single crystals irradiated with heavy ions
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Magneto-optical study of Ba(Fe_(1-x)M_x)_2As_2 (M=Co and Ni) single crystals irradiated with heavy ions

机译：重离子辐照Ba（Fe_（1-x）M_x）_2As_2（M = Co和Ni）单晶的磁光研究

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摘要

Optimally doped single crystals of Ba(Fe_(1-x)M_x)_2As_2 (M=Co, Ni) were irradiated with 1.4 GeV ~(208)Pb~(56+) ions at fluences corresponding to matching fields of B_?=0.1, 0.5, 1, and 2 T. Magneto-optical imaging has been used to map the distribution of the magnetic induction in the irradiated samples. The imaging is complemented by the magnetization measurements. The results show a substantial enhancement of the apparent critical current densities as revealed by the much larger Bean penetration fields and an increase in the hysteretic magnetization. However, the effect depends on the compound, temperature, and applied magnetic field. In Ba(Fe_(0.926)Co_(0.074))_2As_2 crystals, at 15 K and low fields, the enhancement appears to scale with the irradiation dose at a rate of about 0.27 MA·cm~(-2) T~(-1), whereas in Ba(Fe_(0.954)Ni_(0.046))_2As_2 crystals, higher irradiation doses are less effective. Our results suggest that moderate irradiation with heavy ions is an effective way to homogeneously enhance the current-currying capabilities of pnictide superconductors.
机译：用1.4 GeV〜（208）Pb〜（56+）离子以对应于B _？= 0.1匹配场的注量辐照Ba（Fe_（1-x）M_x）_2As_2（M = Co，Ni）的最佳掺杂单晶。分别为0.5、1和2T。磁光成像已被用来绘制被辐照样品中磁感应强度的分布图。成像通过磁化测量得到补充。结果表明，通过更大的Bean穿透场和磁滞磁化强度的增加可以看出，表观的临界电流密度有了很大的提高。但是，效果取决于化合物，温度和施加的磁场。 Ba（Fe_（0.926）Co_（0.074））_ 2As_2晶体在15 K低磁场下，辐照剂量约为0.27 MA·cm〜（-2）T〜（-1）时，增强作用呈比例缩放。 ），而在Ba（Fe_（0.954）Ni_（0.046））_ 2As_2晶体中，较高的辐照剂量效果较差。我们的结果表明，用重离子进行适度的辐射是有效提高Pnictide超导体电流流动能力的有效方法。

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  • 来源
    《Physical review》 |2010年第9期|p.094509.1-094509.5|共5页
  • 作者

    R. Prozorov; M. A. Tanatar; B. Roy; N. Ni; S. L. Budko; P. C. Canfield; J. Hua; U. Welp; W. K. Kwok;

  • 作者单位

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

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

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

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

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

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

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic properties; critical currents;

    机译：磁性临界电流;

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