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We have performed high resolution angle resolved photoemission (ARPES)studies on electron doped cuprate superconductors Sm2-xCexCuO4 (x=0.10, 0.15,0.18), Nd2-xCexCuO4 (x=0.15) and Eu2-xCexCuO4 (x=0.15). Imaginary parts of theelectron removal self energy show step-like features due to an electron-bosonicmode coupling. The step-like feature is seen along both nodal and anti-nodaldirections but at energies of 50 and 70 meV, respectively, independent of thedoping and rare earth element. Such energy scales can be understood as beingdue to preferential coupling to half- and full-breathing mode phonons,revealing the phononic origin of the kink structures. Estimated electron-phononcoupling constant lambda from the self energy is roughly independent of thedoping and momentum. The isotropic nature of lambda is discussed in comparisonwith the hole doped case where a strong anisotropy exists.

Angle-resolved photoemission spectroscopy of electron-doped cuprate superconductors: Isotropic electron-phonon coupling