S. V. Borisenko, A. A. Kordyuk, A. Koitzsch, T. K. Kim, K. Nenkov, M. Knupfer, J. Fink, C. Grazioli, S. Turchini, and H. Berger

Phys. Rev. Lett. 92, 207001 (2004).

We use angle-resolved photoemission with circularly polarized excitation to demonstrate that in the 5x1 superstructure-free (Pb,Bi)2Sr2CaCu2O8+d (Pb-Bi2212) material there are no signatures of time-reversal symmetry breaking in the sense of the criteria developed earlier [Kaminski et al., Nature (London) 416, 610 (2002)]. The dichroic signal retains reflection antisymmetry as a function of temperature and doping and in all mirror planes, precisely defined by the experimental dispersion at low energies. The obtained results demonstrate that the signatures of time-reversal symmetry violation in pristine Bi2212, as determined by angle-resolved photoemission spectroscopy, are not a universal feature of all cuprate superconductors.

[ online preprint: cond-mat/0305179 ]