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Science 24 September 1999:
Vol. 285. no. 5436, pp. 2110 - 2113
DOI: 10.1126/science.285.5436.2110
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Reports

Evidence for Quantum Critical Behavior in the Optimally Doped Cuprate Bi2Sr2CaCu2O8+delta

T. Valla, 1 A. V. Fedorov, 1 P. D. Johnson, 1 B. O. Wells, 14 S. L. Hulbert, 2 Q. Li, 3 G. D. Gu, 5 N. Koshizuka 6

The photoemission line shapes of the optimally doped cuprate Bi2Sr2CaCu2O8+delta were studied in the direction of a node in the superconducting order parameter by means of very high resolution photoemission spectroscopy. The peak width or inverse lifetime of the excitation displays a linear temperature dependence, independent of binding energy, for small energies, and a linear energy dependence, independent of temperature, for large binding energies. This behavior is unaffected by the superconducting transition, which is an indication that the nodal states play no role in the superconductivity. Temperature-dependent scaling suggests that the system displays quantum critical behavior.

1 Department of Physics,
2 National Synchrotron Light Source,
3 Division of Materials Sciences, Brookhaven National Laboratory, Upton, NY 11973-5000, USA.
4 Department of Physics, University of Connecticut, Storrs, CT 06269, USA.
5 School of Physics, The University of New South Wales, Post Office Box 1, Kensington, New South Wales, Australia 2033.
6 Superconductivity Research Laboratory, ISTEC, 10-13, Shinonome I-chrome, Koto-ku, Tokyo 135, Japan.

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