Relationship between the parent charge transfer gap and maximum transition temperature in cuprates  

作　　者：Wei Ruan Cheng Hu Jianfa Zhao Peng Cai Yingying Peng Cun Ye Runze Yu Xintong Li Zhenqi Hao Changqing Jin Xingjiang Zhou Zheng-Yu Weng Yayu Wang Wei Ruan;Cheng Hu;Jianfa Zhao;Peng Cai;Yingying Peng;Cun Ye;Runze Yu;Xintong Li;Zhenqi Hao;Changqing Jin;Xingjiang Zhou;Zheng-Yu Weng;Yayu Wang(State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics, Tsinghua University, Beijing 100084,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences,;Collaborative Innovation Center of Quantum Matter,Beijing 100084, China;Institute for Advanced Study, Tsinghua University,Beijing 100084, China)

机构地区：[1]State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics, Tsinghua University, Beijing 100084,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences, [3]Collaborative Innovation Center of Quantum Matter,Beijing 100084, China [4]Institute for Advanced Study, Tsinghua University,Beijing 100084, China

出　　处：《Science Bulletin》2016年第23期1826-1832,共7页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China and Ministry of Science and Technology of the People’s Republic of China;financial support from the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB07020300)

摘　　要：One of the biggest puzzles concerning the cup- rate high temperature superconductors is what determines the maximum transition temperature （Tc,max）, which varies from less than 30 to above 130 K in different compounds. Despite this dramatic variation, a robust trend is that within each family, the double-layer compound always has higher Tc,max than the single-layer counterpart. Here we use scanning tunneling microscopy to investigate the electronic structure of four cuprate parent compounds belonging to two different families. We find that within each family, the double layer compound has a much smaller charge transfer gap size （ACT）, indicating a clear anticorrelation between AcT and Tc,max. These results suggest that the charge transfer gap plays a key role in the superconducting physics of cuprates, which shed important new light on the high To mechanism from doped Mott insulator perspective.One of the biggest puzzles concerning the cuprate high temperature superconductors is what determines the maximum transition temperature(Tc,max), which varies from less than 30 to above 130 K in different compounds.Despite this dramatic variation, a robust trend is that within each family, the double-layer compound always has higher Tc,maxthan the single-layer counterpart. Here we use scanning tunneling microscopy to investigate the electronic structure of four cuprate parent compounds belonging to two different families. We find that within each family, the double layer compound has a much smaller charge transfer gap size(DCT), indicating a clear anticorrelation between DCTand Tc,max. These results suggest that the charge transfer gap plays a key role in the superconducting physics of cuprates, which shed important new light on the high Tc mechanism from doped Mott insulator perspective.

关 键 词：CUPRATES Mot insulator Charge transfer gap - Maximum transition temperature Scanning tunneling microscopy 

分 类 号：O511.3[一般工业技术—材料科学与工程]