An angle-resolved photoemission study of the scattering rate in the superconducting phase of the high-temperature superconductor \LSCO\ with x=0.145 and x=0.17, as a function of binding energy and momentum, is presented. We observe that the scattering rate scales linearly with binding energy up to the high-energy scale E1∼0.4 eV. The scattering rate is found to be strongly anisotropic, with a minimum along the (0,0)-(π,π) direction. A possible connection to a quantum-critical point is discussed.
@article{arxiv.0708.2782,
title = {Anisotropic quasiparticle scattering rates in slightly underdoped to optimally doped high-temperature \LSCO\ superconductors},
author = {J. Chang and M. Shi and S. Pailhes and M. Maansson and T. Claesson and O. Tjernberg and A. Bendounan and Y. Sassa and L. Patthey and N. Momono and M. Oda and M. Ido and S. Guerrero C. Mudry and J. Mesot},
journal= {arXiv preprint arXiv:0708.2782},
year = {2015}
}