Unconventional superconductivity in the single-atom-layer alloy Si(111)−√3×√3−(Tl,Pb)

作     者：T. Nakamura H. Kim S. Ichinokura A. Takayama A. V. Zotov A. A. Saranin Y. Hasegawa S. Hasegawa 

作者机构：Department of Physics University of Tokyo Hongo Tokyo 113-0033 Japan The Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277-8581 Japan Institute of Automation and Control Processes FEB RAS 690041 Vladivostok Russia and School of Natural Sciences Far Eastern Federal University 690000 Vladivostok Russia 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2018年第98卷第13期

页      面：134505-134505页

核心收录：

基　　金：Japan Society for the Promotion of Science, JSPS, (15H02105, 16H02108, 18K19013, 22246006, 25246025) Ministry of Education, Culture, Sports, Science and Technology, MEXT, (25110010) Russian Foundation for Basic Research, RFBR, (16-52-50049) 

主　　题：Rashba coupling Spin-triplet pairing Superconductivity Surface states Surfaces Scanning probe microscopy Scanning tunneling spectroscopy 

摘      要：We present results of low-temperature scanning tunneling microscopy/spectroscopy measurements on the one-atom-layer superconductor, Si(111)−√3×√3−(Tl,Pb) 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 of 2Δ/kBTC∼8.6(kB is the Boltzmann constant and TC is 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.