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Science 10 April 1998:
Vol. 280. no. 5361, pp. 259 - 262
DOI: 10.1126/science.280.5361.259
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Reports

Temperature-Induced Momentum-Dependent Spectral Weight Transfer in Bi2Sr2CaCu2O8+delta

Z.-X. Shen, P. J. White, D. L. Feng, C. Kim, G. D. Gu, H. Ikeda, R. Yoshizaki, N. Koshizuka

Angle-resolved photoemission data from the cuprate superconductor Bi2Sr2CaCu2O8+delta above and below the superconducting transition temperature Tc reveal momentum-dependent changes that extend up to an energy of about 0.3 electron volt, or 40kTc (where k is the Boltzmann constant). The data suggest an anomalous transfer of spectral weight from one momentum to another, involving a sizable momentum transfer Q ~ (0.45pi , 0). The observed Q is intriguingly near the charge-order periodicity required if fluctuating charge stripes are present.

Z.-X. Shen, P. J. White, D. L. Feng, C. Kim, Department of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305, USA.
G. D. Gu, School of Physics, The University of New South Wales, Post Office Box 1, Kensington, New South Wales 2033, Australia.
H. Ikeda and R. Yoshizaki, Institute of Applied Physics and Cryogenics Center, University of Tsukuba, Tsukuba, Ibaraki 305, Japan.
N. Koshizuka, Superconductivity Research Laboratory, ISTEC, 10-13 Shinonome, 1-chome, Koto-ku, Tokyo 135, Japan.

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