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首页> 外文期刊>Physical review >In-plane electronic anisotropy in underdoped Ba(Fe_(1-x)Co_x)_2As_2 revealed by partial detwinning in a magnetic field
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In-plane electronic anisotropy in underdoped Ba(Fe_(1-x)Co_x)_2As_2 revealed by partial detwinning in a magnetic field

机译:磁场中的部分解缠揭示了欠掺杂Ba(Fe_(1-x)Co_x)_2As_2中的面内电子各向异性

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摘要

We present results of angle-dependent magnetoresistance measurements and direct optical images of under-doped Ba(Fe_(1-x)Co_x)_2As_2 which reveal partial detwinning by action of a 14 T magnetic field. The relative change in the twin domain population for the given field is modest, of order 5-15 %. The associated field-induced hysteretic changes in the resistivity are up to 5% for intermediate Co concentrations, implying a large in-plane resistivity anisotropy in the broken-symmetry state. Based on the generic anisotropic susceptibility of collinear antiferromagnets, we infer a smaller resistivity along the antiferromagnetic ordering direction. The observation of field-induced motion of twin boundaries indicates a substantial magnetoelastic coupling in this material.
机译:我们提出了角度相关的磁阻测量结果和掺杂不足的Ba(Fe_(1-x)Co_x)_2As_2的直接光学图像,这些图像揭示了14 T磁场作用引起的部分纠缠。对于给定字段,双域域人口的相对变化是适度的,约为5-15%。对于中间的Co浓度,相关的电场引起的电阻率滞后变化高达5%,这意味着在对称对称状态下,较大的面内电阻率各向异性。基于共线反铁磁体的一般各向异性,我们推断出沿反铁磁有序方向的电阻率较小。磁场引起的双边界运动的观察表明在这种材料中存在实质的磁弹性耦合。

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  • 来源
    《Physical review》 |2010年第21期|P.214502.1-214502.5|共5页
  • 作者单位

    Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA Stanford Institute of Energy and Materials Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    rnDepartment of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA Stanford Institute of Energy and Materials Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    rnE. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA;

    E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA;

    E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA National Institute of Informatics, Hitotsubashi 2-1-2, Chiyoda-ku, Tokyo 101-8403, Japan HRL Laboratories, LLC, 3011 Malibu Canyon Rd., Malibu, CA 90265-4797, USA;

    rnE. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA National Institute of Informatics, Hitotsubashi 2-1-2, Chiyoda-ku, Tokyo 101-8403, Japan;

    Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA Stanford Institute of Energy and Materials Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

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  • 正文语种 eng
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  • 关键词

    magnetic properties; mechanical and acoustical properties, elasticity, and ultrasonic; transition temperature variations;

    机译:磁性机械和声学特性;弹性和超声波;转变温度变化;

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