The study of the stripe phase La1.48Nd0.4Sr0.12CuO4 by electrochemical doping

We have studied the effects of hole doping into stripe phase composition La 1.48Nd0.4SrO0.12CuO4 Precise amount of holes. in steps of increasing hole c oncentration (p) by Deltap=0.002-0.003, are introduced into the sample by e lectrochemical oxidation up to p=0.146. The LTO to LTT structural transitio n temperature (T-0) decreases with increasing p and disappears for p greate r than or equal to 0.13, Both static charge order and static spin order are suppressed upon carrier doping. Clear competition between static stripe or ders and superconductivity is observed. A dramatic increase of T-c by eight degrees is observed in a very narrow hole concentration range (Deltap = 0. 004). We suggest that this is due to the fast transformation of the lower T -c stripe phase to the stable 30K superconducting phase.