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首页> 外文期刊>Physical review >Critical behavior of the spin density wave transition in underdoped Ba(Fe_(1-x)Co_x)_2As_2 (x ≤0.05): ~(75)As NMR investigation
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Critical behavior of the spin density wave transition in underdoped Ba(Fe_(1-x)Co_x)_2As_2 (x ≤0.05): ~(75)As NMR investigation

机译:Ba(Fe_(1-x)Co_x)_2As_2(x≤0.05):〜(75)As NMR研究中自旋密度波跃迁的临界行为

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摘要

We investigate the nature of the SDW (spin density wave) transition in the underdoped regime of an iron-based high-T_c superconductor Ba(Fe_(1-x)Co_x)_2As_2 by ~(75)As NMR, with primary focus on a composition with x = 0.02 (T_(SDW) = 99 K). We demonstrate that critical slowing down toward the three-dimensional SDW transition sets in at the tetragonal to orthorhombic structural phase transition T_s = 105 K, suggesting strong interplay between structural distortion and spin correlations. In the critical regime between T_s and 7_(SDW). the dynamical structure factor of electron spins S(q,ω_n) measured with the longitudinal NMR relaxation rate 1/T_1 exhibits a divergent behavior obeying a power law 1/T_1 α Σ_qS(q,ω_n) ~ (T/T_(SDW)- 1)~(-δ) with the critical exponent δ ~ 0.33.
机译:我们通过〜(75)As NMR研究了铁基高T_c超导体Ba(Fe_(1-x)Co_x)_2As_2的掺杂不足状态中SDW(自旋密度波)跃迁的性质,主要关注于x = 0.02(T_(SDW)= 99 K)的合成。我们证明,在向正交结构的正交相变T_s = 105 K时,向三维SDW过渡的临界速度变慢,这表明结构变形和自旋相关性之间存在强烈的相互作用。在T_s和7_(SDW)之间的临界状态下。以纵向NMR弛豫速率1 / T_1测得的电子自旋S(q,ω_n)的动力学结构因子表现出服从幂定律1 / T_1的发散行为αΣ_qS(q,ω_n)〜(T / T_(SDW)- 1)〜(-δ),临界指数δ〜0.33。

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  • 来源
    《Physical review》 |2014年第21期|214511.1-214511.8|共8页
  • 作者单位

    Department of Physics, Zhejiang University, Hangzhou 310027, P. R. China;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S4M1;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S4M1;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S4M1,Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G1Z8;

    Materials Science and Technology Division, Oak Ridge National Laboratory, Tennessee 37831, USA;

    National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences, Beijing 100190, P. R. China;

    National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences, Beijing 100190, P. R. China;

    Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G1Z8,National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics,Chinese Academy of Sciences, Beijing 100190, P. R. China,Center for Superconducting Physics and Materials, National Laboratory for Solid State Microstructures,Department of Physics, Nanjing University, Nanjing 210093, P. R. China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    nuclear magnetic resonance and relaxation;

    机译:核磁共振与弛豫;

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