Abrupt onset of a second energy gap at the superconducting transition of underdoped Bi2212

W. S. Lee (), I. M. Vishik, K. Tanaka, D. H. Lu, T. Sasagawa, N. Nagaosa, T. P. Devereaux, Z. Hussain and Z.-X. Shen ()
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W. S. Lee: Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
I. M. Vishik: Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
K. Tanaka: Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
D. H. Lu: Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
T. Sasagawa: Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
N. Nagaosa: University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
T. P. Devereaux: University of Waterloo
Z. Hussain: Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
Z.-X. Shen: Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA

Nature, 2007, vol. 450, issue 7166, 81-84

Abstract: In underdoped high-TC superconducting copper oxides a pseudogap develops well above TC. Whether the pseudogap is a distinct phenomenon or the incoherent continuation of the superconducting gap above TC is one of the central questions in high- TC research. A direct and unambiguous observation of a single-particle gap tied to the superconducting transition as function of temperature is discovered in underdoped Bi2Sr2CaCu2O8+δ.

Date: 2007
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DOI: 10.1038/nature06219

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