论文标题
通过亚kelvin磁力显微镜检查重绒毛超导体的局部表征
Local characterization of a heavy-fermion superconductor via sub-Kelvin magnetic force microscopy
论文作者
论文摘要
使用在子kelvin温度下运行的磁力显微镜，我们表征了重毛绒超导体Cecoin $ _5 $。我们指出了绝对的伦敦穿透深度$λ（0）= 435 \ pm 20 $ nm并报告其温度依赖性，这与超导间隙的对称性紧密相关。此外，我们直接测量单个Abrikosov涡流的固定力，并估算关键电流密度$ J_C = 9 \ times 10^4 $ a/cm $ $^2 $。与相关的，公认的隧道二极管振荡器技术相反，我们的方法能够在超低温度下在微米尺度上解决本地$的不均匀性$。
Using magnetic force microscopy operating at sub-Kelvin temperatures we characterize the heavy-fermion superconductor CeCoIn$_5$. We pinpoint the absolute London penetration depth $λ(0) = 435 \pm 20$ nm and report its temperature dependence, which is closely linked to the symmetry of the superconducting gap. In addition, we directly measure the pinning force of individual Abrikosov vortices and estimate the critical current density $j_c = 9 \times 10^4$ A/cm$^2$. In contrast to the related, well-established tunnel diode oscillator technique, our method is capable of resolving inhomogeneities $locally$ on the micrometer-scale at ultra-low temperature.
