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Science 20 January 1995:
Vol. 267. no. 5196, pp. 343 - 350
DOI: 10.1126/science.267.5196.343
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Articles

Photoemission Studies of High-Tc Superconductors: The Superconducting Gap

Z. -X. Shen 1, W. E. Spicer 2, D. M. King 2, D. S. Dessau 3, and B. O. Wells 4

1 Department of Applied Physics and Solid State Laboratory, Stanford University, Stanford, CA 94305, and Stanford Synchrotron Radiation Laboratory, Stanford, CA 94309-0210, USA.
2 Stanford Synchrotron Radiation Laboratory, Stanford, CA 94309-0210, and Solid State Laboratory, Stanford University, Stanford, CA 94305, USA.
3 Stanford Synchrotron Radiation Laboratory, Stanford, CA 94309-0210, USA.
4 Physics Department, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Over the last several years there have been great improvements in the energy resolution and detection efficiency of angle-resolved photoemission spectroscopy. These improvements have made it possible to discover a number of fascinating features in the electronic structure of the high transition temperature (Tc) superconductors: apparently bandlike Fermi surfaces, flat-band saddle points, and nested Fermi surface sections. Recent work suggests that these features, previously thought explainable only by one-electron band theory, may be better understood with a many-body approach. Furthermore, other properties of the high-Tc superconductors, which are difficult to understand with band theory, are well described using a many-body picture. Angle-resolved photoemission spectroscopy has also been used to investigate the nature of the superconducting pairing state, revealing an anisotropic gap consistent with a d-wave order parameter and fueling the current debate over s-wave versus d-wave superconductivity.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Electronic Structure of Mott Insulators Studied by Inelastic X-ray Scattering.
M. Z. Hasan, E. D. Isaacs, Z.-X. Shen, L. L. Miller, K. Tsutsui, T. Tohyama, and S. Maekawa (2000)
Science 288, 1811-1814
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Science. ISSN 0036-8075 (print), 1095-9203 (online)