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首页> 外文期刊>Physical review >Coexistence of superconductivity and magnetism in K_xFe_(2-y)Se_(2-z)S_z (z = 0,0.4)
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Coexistence of superconductivity and magnetism in K_xFe_(2-y)Se_(2-z)S_z (z = 0,0.4)

机译：K_xFe_（2-y）Se_（2-z）S_z（z = 0,0.4）中超导和磁性的共存

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摘要

Single crystals K_xFe_(2-y)Se_(2-z)S_z (z = 0, 0.4) are successfully synthesized by self-flux method with the superconducting transition temperatures T_c~(onset) of 31.3 K and 32.8 K, respectively. In contrast to external pressure effect on superconductivity, the substitution of S for Se does not suppress T_c, which suggests that chemical doping may mainly modulate the anion height from the Fe layer rather than compressing interlayer distance. In electron spin resonance (ESR) measurements, a resonance signal arising from the paramagnetic (PM) Fe ions is detected at room temperature for both K_xFe_(2-y)Se_2 and K_xFe_(2-y)Se_(1.6)S_(0.4) crystals. Upon cooling, the intensity of the spectrum weakens gradually and displays abrupt decrease below 140 K. The resonance signal disappears around 60 K (~2 T_c), corresponding to the saturation temperature of antiferromagnetic (AFM) order revealed by recent neutron-diffraction study. The evolution of ESR spectrum is discussed by correlating with recent neutron-diffraction and Raman-scattering results, in support of the coexistence of superconductivity and AFM order in K_xFe_(2-y)Se_2. Moreover, the variation of resonance field with decreasing temperature for K_xFe_(2-y)Se_(1.6)S_(0.4) implies that the doping of S induces local weak ferromagnetism in the parent AFM background.
机译：采用自通量法成功地合成了单晶K_xFe_（2-y）Se_（2-z）S_z（z = 0，0.4），其超导转变温度T_c〜（起始）分别为31.3 K和32.8K。与外部压力对超导性的影响相反，用S代替Se不会抑制T_c，这表明化学掺杂可能主要调节距Fe层的阴离子高度，而不是压缩层间距离。在电子自旋共振（ESR）测量中，在室温下同时检测到K_xFe_（2-y）Se_2和K_xFe_（2-y）Se_（1.6）S_（0.4）的顺磁性（PM）Fe离子产生的共振信号晶体。冷却后，光谱强度逐渐减弱，并在140 K以下突然降低。共振信号在60 K（〜2 T_c）左右消失，这与最近中子衍射研究揭示的反铁磁（AFM）阶的饱和温度相对应。通过与最近的中子衍射和拉曼散射结果相关联，讨论了ESR谱的演化，以支持K_xFe_（2-y）Se_2中超导性和AFM有序共存。此外，K_xFe_（2-y）Se_（1.6）S_（0.4）随温度降低共振场的变化表明，S的掺杂会在母体AFM背景中引起局部弱铁磁性。

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  • 来源
    《Physical review》 |2011年第17期|p.174501.1-174501.7|共7页
  • 作者

    L. Li; Z. R. Yang; Z. T. Zhang; W. Tong; C. J. Zhang; S. Tan; Y. H. Zhang;

  • 作者单位

    High Magnetic Field Laboratory, University of Science and Technology of China, Hefei 230026, People's Republic of China,Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    High Magnetic Field Laboratory, University of Science and Technology of China, Hefei 230026, People's Republic of China;

    High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    High Magnetic Field Laboratory, University of Science and Technology of China, Hefei 230026, People's Republic of China;

    High Magnetic Field Laboratory, University of Science and Technology of China, Hefei 230026, People's Republic of China,High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    pressure effects; superconducting materials;

    机译：压力影响;超导材料;

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