Multiple Bosonic Mode Coupling in Electron Self-Energy of (La_2-xSr_x)CuO_4

Abstract

High resolution angle-resolved photoemission spectroscopy data along the (0,0)-($\pi$,$\pi$) nodal direction with significantly improved statistics reveal fine structure in the electron self-energy of the underdoped (La${}_{2-x}$Sr${}_x$)CuO${}_4$ samples in the normal state. Fine structure at energies of (40$\sim$46) meV and (58$\sim$63)meV, and possible fine structure at energies of (23$\sim$29)meV and (75$\sim$85)meV, have been identified. These observations indicate that, in LSCO, more than one bosonic modes are involved in the coupling with electrons.

4 pages, 3 figures, Fig. 2 updated

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