Recent experiments have found that in contrast to the nonsuperconducting bulk RNiO2(R=Nd,La,and Pr),the strontium-doped R1-xSrxNiO2 thin films show superconductivity with the critical temperature Tc of 9-15 K at x=0.2,whose origin of superconductivity deserves further investigation.Based on first-principles calculations,we study the electronic structure,lattice dynamics,and electron-phonon coupling(EPC)of the undoped and doped RNiO2(R=Nd,La,and Pr)at the experimental doping level.Our results show that the EPC-derived Tc's are all about 0K in the undoped and doped RNiO2.The electron-phonon coupling strength is too small to account for the observed superconductivity.We hence propose that the electron-phonon interaction can not be the exclusive origin of the superconductivity in RNiO2(R=Nd,La,and Pr).

Juan-Juan Hao;Pei-Han Sun;Ming Zhang;Xian-Xin Wu;Kai Liu;Fan Yang

School of Physics,Beijing Institute of Technology,Beijing 100081,China;Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices,Renmin University of China,Beijing 100872,China;CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China;Max-Planck-Institut für Festk?rperforschung,Heisenbergstrasse 1,D-70569 Stuttgart,Germany

中国物理快报（英文版）

[1]Juan-Juan Hao;Pei-Han Sun;Ming Zhang;Xian-Xin Wu;Kai Liu;Fan Yang-.First-Principles Study of Hole-Doped Superconductors RNiO2(R=Nd,La,and Pr))[J].中国物理快报（英文版）,2022(06):32-36

Superconductors,RNiO2,nonsuperconducting,xSrxNiO2

First,Principles,Study,Hole,Doped,Nd,La,Recent,experiments,have,found,that,contrast,bulk,strontium,R1,thin,films,show,superconductivity,critical,temperature,Tc,whose,origin,deserves,further,investigation,Based,first,principles,calculations,we,study,electronic,structure,lattice,dynamics,phonon,coupling,EPC,undoped,experimental,doping,level,Our,results,derived,are,about,0K,strength,is,too,small,account,observed,We,hence,propose,interaction,can,not,be,exclusive

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