论文标题
非中心超导体W3AL2C的超导间隙对称性
Superconducting gap symmetry of the noncentrosymmetric superconductor W3Al2C
论文作者
论文摘要
在最近发现的非中心超管w $ _3 $ _2 $ _2 $ c上，已经进行了详细的零场和横向亮场旋转松弛/旋转/旋转（$ $ $ sr）经验，以猜测有关其超导地面状态。通过磁化测量结果确认了低于7.6 K的超导性的批量性质。在$ t_c $上方收集的$μ$ SR光谱没有变化，这排除了$ t_c $以下自发磁场的可能性。这证实了进入超导基态状态后，为w $ _3 $ al $ _2 $ c保留了时间反转对称性。温度依赖性的超流体密度[$ρ_s（t）$]直接反映了超导间隙对称性，这是通过对从横向场$μ$ SR实验获得的光谱的分析获得的。尽管非中心对称结构，但W $ _3 $ al $ _2 $ C采用了完全张开的自旋单向超导型基态，零温度值为gap $δ_0$ = 1.158（8）MEV，gAP-to-t_c $ t_c $均值2 $Δ_0/k_bt_c $Δ_0/k_bt_c \ 3.54，大约3.54，cou y 3.54，cou。超导体。
A detailed zero-field and transverse-field muon spin relaxation/rotation ($μ$SR) experiemnts have been carried out on the recently discovered non-centrosymmetric superconductor W$_3$Al$_2$C to speculate about its superconducting ground state. Bulk nature of superconductivity below 7.6 K is confirmed through magnetization measurements. No change in the $μ$SR spectra collected above and below $T_c$ is visible, ruling out the possibility of spontaneous magnetic field below $T_c$. This confirms that time-reversal symmetry is preserved for W$_3$Al$_2$C upon entering in the superconducting ground state. Temperature dependent superfluid density [$ρ_s(T)$], which directly reflects the superconducting gap symmetry is obtained by the analysis of spectra obtained from the transverse-field $μ$SR experiments. Despite a non-centrosymmetric structure, W$_3$Al$_2$C adopts a fully gaped spin-singlet superconducting ground state with a zero temperature value of gap $Δ_0$ = 1.158(8) meV with gap-to-$T_c$ ratio 2$Δ_0/k_BT_c\approx$3.54, classifying this material as a weakly-coupled superconductors.
