Abstract
Ru-based superconductor LaRu2As2 has been discovered exhibiting the highest critical temperature of～7.8 K among iron-free transition metal pnictides with the ThCr2Si2-type crystal structure.However,microscopic research on this novel superconducting material is still lacking.Here,we utilize scanning tunneling microscopy/spectroscopy to uncover the superconductivity and surface structure of LaRu2As2.Two distinct terminating surfaces are identified on the cleaved crystals,namely,the As surface and the La surface.Atomic missing line defects are observed on the La surface.Both surfaces exhibit a superconducting gap of～1.0 meV.By employing quasiparticle interference techniques,we observe standing wave patterns near the line defects on the La atomic plane.These patterns are attributed to quasiparticle scattering from two electron type parabolic bands.
基金项目
National Natural science Foundation of China(62488201)
National Natural science Foundation of China(52072401)
National Key R&D Program of China(2019YFA0308500)
Chinese Academy of Sciences(YSBR-003)
Innovation Program of Quantum Science and Technology(2021ZD0302700)
NETL
NSTL
万方数据