Electronic origin of the inhomogeneous pairing interaction in the high-Tc superconductor Bi2Sr2CaCu 2O8+δ

Abhay N. Pasupathy, Aakash Pushp, Kenjiro K. Gomes, Colin V. Parker, Jinsheng Wen, Zhijun Xu, Genda Gu, Shimpei Ono, Yoichi Ando, Ali Yazdani

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168 Scopus citations


Identifying the mechanism of superconductivity in the high-temperature cuprate superconductors is one of the major outstanding problems in physics. We report local measurements of the onset of superconducting pairing in the high-transition temperature (Tc) superconductor Bi2Sr 2CaCu2O8+δ using a lattice-tracking spectroscopy technique with a scanning tunneling microscope. We can determine the temperature dependence of the pairing energy gaps, the electronic excitations in the absence of pairing, and the effect of the local coupling of electrons to bosonic excitations. Our measurements reveal that the strength of pairing is determined by the unusual electronic excitations of the normal state, suggesting that strong electron-electron interactions rather than low-energy (<0.1 volts) electron-boson interactions are responsible for superconductivity in the cuprates.

Original languageEnglish (US)
Pages (from-to)196-201
Number of pages6
Issue number5873
StatePublished - Apr 11 2008

All Science Journal Classification (ASJC) codes

  • General


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