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首页> 外文期刊>Physical review >Superconducting and normal-state properties of single-crystalline Tl_(0.47)Rb_(0.34)Fe_(1.63)Se_2 as seen via~(77)Se and ~(87)Rb NMR
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Superconducting and normal-state properties of single-crystalline Tl_(0.47)Rb_(0.34)Fe_(1.63)Se_2 as seen via~(77)Se and ~(87)Rb NMR

机译:通过〜(77)Se和〜(87)Rb NMR观察到的单晶Tl_(0.47)Rb_(0.34)Fe_(1.63)Se_2的超导和常态性质

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摘要

We report both ~(77)Se and ~(87)Rb nuclear magnetic resonance (NMR) studies on Tl_(0.47)Rb_(0.34)Fe_(1.63)Se_2 single-crystalline superconductors (T_c≈32 K). Singlet superconductivity is suggested by a sharp drop of the Knight shift K(T) below T_c, after subtracting the superconducting diamagnetic effect. However, the Hebel-Slichter coherence peak below T_c is not observed in the spin-lattice relaxation rate l/T_1, even with a low in-plane NMR field of 2.6 T. Just above T_c, no evidence of low-energy spin fluctuation is found in the spin-lattice relaxation rate on both the 77Se and the ~(87)Rb sites. Upon warming, however, the Knight shifts and the spin-lattice relaxation rates of both nuclei increase substantially with temperature. In particular, the Knight shift is nearly isotropic and follow a function fit of K = a + bT_2 from T_c up to 300 K. Our observations should put a strong constraint to the theory of magnetism and superconductivity in the recently discovered iron selenide superconductors.
机译:我们报告了对Tl_(0.47)Rb_(0.34)Fe_(1.63)Se_2单晶超导体(T_c≈32K)的〜(77)Se和〜(87)Rb核磁共振(NMR)研究。减去超导抗磁效应后,奈特位移K(T)在T_c以下急剧下降,表明了单重态超导性。但是,即使在2.6 T的低面内NMR场中,在自旋晶格弛豫速率l / T_1中也未观察到低于T_c的Hebel-Slichter相干峰。在77Se和〜(87)Rb位点的自旋晶格弛豫速率中发现然而,在变暖时,奈特移动,并且两个核的自旋晶格弛豫速率都随温度而显着增加。特别是,奈特位移几乎是各向同性的,并且从T_c到300 K遵循K = a + bT_2的函数拟合。我们的观察结果应该对最近发现的硒化铁超导体的磁学和超导性理论施加强烈的约束。

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  • 来源
    《Physical review》 |2011年第17期|p.174510.1-174510.6|共6页
  • 作者单位

    Department of Physics, Renmin University of China, Beijing 100872, China;

    Department of Physics, Renmin University of China, Beijing 100872, China;

    School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;

    Department of Physics, Renmin University of China, Beijing 100872, China;

    Department of Physics, Renmin University of China, Beijing 100872, China;

    Department of Physics, Renmin University of China, Beijing 100872, China;

    Department of Physics, Renmin University of China, Beijing 100872, China;

    Department of Physics, Renmin University of China, Beijing 100872, China;

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  • 原文格式 PDF
  • 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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