Observation of Nodal Superconducting Gaps in Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+<i>x</i></sub> Topped With Copper-Oxide Films
ORAL
Abstract
We have grown CuO thin films on Bi2Sr2CaCu2O8+x substrates by ozone-assisted molecular beam epitaxy and investigated the electronic structure by in-situ angle-resolved photoemission spectroscopy. We observe similar low-energy band structure compared as in Bi2Sr2CaCu2O8+x, while the wide energy spectrum is consistent with an insulating state,even with different amount of CuO. The superconducting gap structure fits well to the dX2-Y2 gap form. Our results suggest that the d-wave is robust in this system and that the reported U-like gap by STM is possibly a minority and “local” state, to which ARPES is not very sensitive.
*national natural science foundation of China
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Presenters
Jianyu Guan
Institute of Physics, Chinese Academy of Sciecses
Institute of physics, Chinese Academy of Sciences
Authors
Jianyu Guan
Institute of Physics, Chinese Academy of Sciecses
Institute of physics, Chinese Academy of Sciences
Xun Shi
Department of Physics and JILA, University of Colorado and NIST
Institute of Physics, Chinese Academy of Sciences
University of Colorado Boulder
Univ of Colorado - Boulder
Univ of Colorado-Boulder
yigui zhong
Institute of Physics, Chinese Academy of Sciecses
Pierre Richard
Chinese Academy of Scienes (CAS)
Institute of Physics, Chinese Academy of Sciecses
hangjiang liu
Institute of Physics, Chinese Academy of Sciecses
Ziqiang Wang
Boston College
Department of Physics, Boston Coll
Boston university
Department of Physics, Boston College
Boston Coll
Genda Gu
Brookhaven National Laboratory
Brookhaven National Labs
Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory
Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory
