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

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Science  10 Apr 1998:
Vol. 280, Issue 5361, pp. 259-262
DOI: 10.1126/science.280.5361.259

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

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