Observation of parabolic electron bands on superconductor LaRu_(2)As_(2)  

作　　者：周兴泰 李更 潘禄禄 陈子超 李萌 时延昊 杨海涛 高鸿钧 Xingtai Zhou;Geng Li;Lulu Pan;Zichao Chen;Meng Li;Yanhao Shi;Haitao Yang;Hong-Jun Gao(Beijing National Center for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Hefei National Laboratory,Hefei 230088,China)

机构地区：[1]Beijing National Center for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [3]Hefei National Laboratory,Hefei 230088,China

出　　处：《Chinese Physics B》2024年第7期60-64,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.62488201 and 52072401);the National Key R&D Program of China(Grant No.2019YFA0308500);the Chinese Academy of Sciences(Grant No.YSBR-003);the Innovation Program of Quantum Science and Technology(Grant No.2021ZD0302700)。

摘　　要：Ru-based superconductor LaRu_(2)As_(2) has been discovered exhibiting the highest critical temperature of ~ 7.8 K among iron-free transition metal pnictides with the ThCr_(2)Si_(2)-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 LaRu_(2)As_(2). 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 me V. 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.

关 键 词：SUPERCONDUCTIVITY line defect quasi-particle scattering electron band 

分 类 号：O469[理学—凝聚态物理]