Abstract
The effect of B -site substitution on the critical behavior has been investigated in Cr-doped manganites La 0.7 Ca 0.3 Mn 1- x Cr x O 3 ( x =0.00, 0.03 and 0.06) by means of the pump-probe method. We have observed that the Cr-doping suppresses the critical behavior of the relaxation time τ. This suppression has been interpreted in terms of a reduced correlation length of the photoinduced charge-ordering fluctuations due to the B -site impurities.
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