论文标题
超导对称性反对压力的变化非中心对称超导体CD $ _2 $ re $ _2 $ o $ _7 $ $^{185/187} $
Variation in Superconducting Symmetry against Pressure on Noncentrosymmetric Superconductor Cd$_2$Re$_2$O$_7$ Revealed by $^{185/187}$Re Nuclear Quadrupole Resonance
论文作者
论文摘要
我们在压力下进行了$^{185/187} $ re核四极共振（NQR）的测量，以研究非中心超级导体超导体CD $ _ {2} $ re $ re $ re $ $ _ {2} $ _ {2} $ o $ $ $ $ $ $ _ {7} $。通过AC易感性测量确定的超导转换温度$ t _ {\ rm c} $的压力依赖性与以前的电阻率测量结果一致[T. T. C. Kobayashi $ et al $。，J。Phys。 Soc。 JPN。 80，023715（2011）。]。低于2.2 GPA，在核自旋晶格放松率$ 1/t_ {1} $中，观察到一个明显的连贯峰值低于$ t _ {\ rm c} $，这表明常规$ s $ s $ - $ s $ - wave超导性。相比之下，连贯性峰在3.1 GPA下消失，这表明超导对称性变化为$ p $ - 波占主导状态，反对压力。
We performed $^{185/187}$Re nuclear quadrupole resonance (NQR) measurements under pressure to investigate the superconducting properties of noncentrosymmetric superconductor Cd$_{2}$Re$_{2}$O$_{7}$ under various crystal structures. The pressure dependence of superconducting transition temperature $T_{\rm c}$ determined through ac susceptibility measurements is consistent with the results of previous resistivity measurements [T. C. Kobayashi $et al$., J. Phys. Soc. Jpn. 80, 023715 (2011).]. Below 2.2 GPa, in the nuclear spin-lattice relaxation rate $1/T_{1}$, a clear coherence peak was observed just below $T_{\rm c}$, indicating conventional $s$-wave superconductivity. In contrast, the coherence peak disappears at 3.1 GPa, suggesting a change in superconducting symmetry to the $p$-wave dominant state against pressure.
