Changes in the self-energy and d-wave pairing strength with doping in overdoped La(2-x)Sr(x)CuO4
Abstract
Angle resolved photoemission spectroscopy (ARPES) studies of the overdoped cuprate superconductor La2-xSrxCuO4 find only small changes in the near nodal electron self energy over a spectral range of several hundred meV as the doping increases from x=0.2 to x=0.3 and the superconducting transition temperature Tc decreases from 32K to 0K. These measurements put constraints on the structure of the electron-electron interaction. Here we show that a spin-fluctuation interaction leads to behavior which is consistent with these experimental results.
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