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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Magnetic and superconducting properties of an S-type single-crystal CeCu_2Si_2 probed by ~(63)Cu nuclear magnetic resonance and nuclear quadrupole resonance
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Magnetic and superconducting properties of an S-type single-crystal CeCu_2Si_2 probed by ~(63)Cu nuclear magnetic resonance and nuclear quadrupole resonance

机译：〜（63）Cu核磁共振和核四极共振探测S型单晶CeCu_2Si_2的磁和超导性质

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摘要

We have performed ~(63)Cu nuclear-magnetic-resonanceuclear-quadrupole-resonance measurements to investigate the magnetic and superconducting (SC) properties on a "superconductivity dominant" (S-type) single crystal of CeCu_2Si_2. Although the development of antiferromagnetic (AFM) fluctuations down to 1 K indicated that the AFM criticality was close, Korringa behavior was observed below 0.8 K, and no magnetic anomaly was observed above T_c ~ 0.6 K. These behaviors were expected in 5-type CeCu_2Si_2. The temperature dependence of the nuclear spin-lattice relaxation rate 1 / T_1 at zero field was almost identical to that in the previous polycrystalline samples down to 130 mK, but the temperature dependence deviated downward below 120 mK. In fact, 1/T_1 in the SC state could be fitted with the two-gap 5±-wave model rather than the two-gap s++-wave model down to 90 mK. Under magnetic fields, the spin susceptibility in both directions clearly decreased below T_c, which is indicative of the formation of spin-singlet pairing. The residual part of the spin susceptibility was understood by the field-induced residual density of states evaluated from 1/ T_1 T, which was ascribed to the effect of the vortex cores. No magnetic anomaly was observed above the upper critical field H_(c2), but the development of AFM fluctuations was observed, indicating that superconductivity was realized in strong AFM fluctuations.
机译：我们已经进行了〜（63）Cu核磁共振/核四极共振测量，以研究CeCu_2Si_2的“超导性主导”（S型）单晶上的磁性和超导（SC）特性。尽管反铁磁（AFM）波动发展到1 K都表明AFM临界值接近，但在0.8 K以下观察到了Korringa行为，而在T_c〜0.6 K以上未观察到磁异常。在5型CeCu_2Si_2中可以预期到这些行为。在零场时，核自旋晶格弛豫速率1 / T_1的温度依赖性与先前的低至130 mK的多晶样品几乎相同，但温度依赖性在120 mK以下向下偏离。实际上，在SC状态下的1 / T_1可以使用两间隙5±波模型，而不是低至90 mK的两间隙s ++波模型。在磁场下，两个方向上的自旋磁化率明显降低到T_c以下，这表明自旋-单重配对的形成。自旋磁化率的剩余部分可以通过场诱导的从1 / T_1 T评估的状态的剩余密度来理解，这归因于涡流核的作用。在上临界场H_（c2）上方未观察到磁异常，但观察到AFM波动的发展，表明在强AFM波动中实现了超导性。

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  • 来源
    《Physical review. B, Condensed Matter And Materials Physics》 |2017年第13期|134506.1-134506.9|共9页
  • 作者

    Shunsaku Kitagawa; Takumi Higuchi; Masahiro Manago; Takayoshi Yamanaka; Kenji Ishida; H. S. Jeevan; C. Geibel;

  • 作者单位

    Department of Physics, Kyoto University, Kyoto 606-8502, Japan;

    Department of Physics, Kyoto University, Kyoto 606-8502, Japan;

    Department of Physics, Kyoto University, Kyoto 606-8502, Japan;

    Department of Physics, Kyoto University, Kyoto 606-8502, Japan;

    Department of Physics, Kyoto University, Kyoto 606-8502, Japan;

    Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany;

    Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany;

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  • 入库时间 2022-08-18 03:18:36

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