  Following the recent discovery of a bulk photovoltaic effect in the
Pb[(Mg1/3Nb2/3)0.68Ti0.32]O3 crystal, we report here more than one order of
magnitude improvement of photovoltaicity as well as its poling dependence in
the related composition of lead magnesium niobate-lead titanate noted
Pb[(Mg1/3Nb2/3)0.7Ti0.30]O3. Photocurrent measurements versus light intensity
reveal a fascinating hysteretic charge carriers dynamics clearly demonstrating
charge generation, trapping and release processes.
