Sharp resonant multiplet in femto-second optical pair-breaking spectroscopy of YBa2Cu3O7-delta
Li, Eric · Li, J. J. · Sharma, R. P. · Ogale, S. B. · Cao, W. L. · Zhao, Y. G. · Lee, C. H. · Venkatesan, T.
Original · EN
Femto-second optical pair breaking spectroscopy is performed on optimally doped YBa2Cu3O7-delta near 1.5eV. Dramatic photon energy dependence with a sharp triplet fine structure is seen for the first time. The peak separations are attributable to the reported phonon and magnetic excitations in the system. The power dependence is non-linear with differing exponents for the three contributions. These results imply the presence of insulating antiferromagnetic domains in the superconducting state of YBCO over sub-picosecond time scale, and thereby favor an electronic phase separation picture.
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