Unconventional superconductivity in the single-atom-layer alloy Si(111)-√3×√3-(Tl,Pb)
Unconventional superconductivity in the single-atom-layer alloy Si(111)-√3×√3-(Tl,Pb)
复制标题
单原子层合金Si(111)-√3×√3-(Tl,Pb)的非常规超导性
DOI：
10.1103/physrevb.98.134505
复制
发表时间：
2018
影响因子：
3.7
通讯作者：
Hasegawa S.
中科院分区：
文献类型：
--
作者：
Nakamura T.;Kim H.;Ichinokura S.;Takayama A.;Zotov A. V.;Saranin A. A.;Hasegawa Y.;Hasegawa S.
我们给出了单原子层超导体的低温扫描隧道显微镜/光谱测量结果，该超导体由于Rashba-Bychkov效应而具有自旋分裂带结构。结果表明，它具有多个超导带隙Δ(具有显著的各向异性和相当大的大小是玻尔兹曼常数和临界超导温度)。在磁场作用下，即使在涡核也观察到一种倾角结构。倾角结构类似于“伪隙”，因为它保持在2T，远高于输运测量确定的上临界磁场(∼0.7T)。这一非常规行为表明，自旋三重态库珀对可能与宇称破缺的超导体有关。
We present results of low-temperature scanning tunneling microscopy/spectroscopy measurements on the one-atom-layer superconductor,which has a spin-split band structure due to the Rashba-Bychkov effect. It was revealed that it has a multiple superconducting gap Δ with significant anisotropy and sizable magnitude ofis the Boltzmann constant andis the critical superconducting temperature). Under the magnetic field, a dip structure was observed even at the core of the vortex. The dip structure was like a “pseudogap” because it remained up to 2 T, well above the upper critical magnetic field determined in the transport measurements (∼0.7 T). This unconventional behavior suggests the possibility of spin-triplet Cooper pairs related to parity-broken superconductors.