Abstract
High resolution angle-resolved photoemission spectroscopy data along
the (0,0)-(π,π) nodal direction with significantly improved statistics
reveal fine structure in the electron self-energy of the underdoped
(La2-xSrx)CuO4 samples in the normal state. Fine structure at energies
of (40–46) meV and (58–63) meV, and possible fine structure at energies
of (23–29) meV and (75–85) meV, have been identified. These observations
indicate that, in (La2-xSrx)CuO4, more than one bosonic modes are
involved in the coupling with electrons.
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