Possible Fano Effect and Suppression of Andreev Reflection in La_(3)Ni_(2)O_(7)  

作　　者：Yi-feng Yang 杨义峰(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese A cademy of Sciences,Bejing 100190,China;University of Chinese A cademy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Guangdong 523808,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese A cademy of Sciences,Bejing 100190,China [2]University of Chinese A cademy of Sciences,Beijing 100049,China [3]Songshan Lake Materials Laboratory,Guangdong 523808,China

出　　处：《Chinese Physics Letters》2025年第1期141-146,共6页中国物理快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant No.12474136);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB33010100);the National Key Research and Development Program of China(Grant No.2022YFA1402203)。

摘　　要：The recently discovered high-temperature superconductor La_(3)Ni_(2)O_(7)under high pressure has sparked considerable debate.Central controversies revolve around whether interlayer or intralayer pairing mechanisms dominate and whether hybridization plays a crucial role in establishing superconductivity.However,experimental clarification remains challenging due to the limitations of state-of-the-art techniques under high-pressure conditions.Here,we propose that quasiparticle tunneling and Andreev reflection could offer practical methods to differentiate pairing scenarios.Specifically,we predict that hybridization between the d_(x^(2)-y^(2))metallic bands and the strongly renormalized flat d_(z^(2))quasiparticle bands may induce an asymmetric Fano line shape.In the superconducting state,we show that Andreev reflection would be significantly suppressed in interlayer pairing superconductivity with limited interlayer hopping.We recommend future experiments to test these predictions and shed light on the fundamental physics of superconducting La_(3)Ni_(2)O_(7)and other multi-layer nickelate superconductors.

关 键 词：INTERLAYER BANDS SUPERCONDUCTIVITY 

分 类 号：O76[理学—晶体学]