Temperature-induced momentum-dependent spectral weight transfer in Bi2Sr2CaCu2O8+delta

Science. 1998 Apr 10;280(5361):259-62. doi: 10.1126/science.280.5361.259.

Abstract

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 approximately (0.45pi, 0). The observed Q is intriguingly near the charge-order periodicity required if fluctuating charge stripes are present.