ab-plane resistivity and possible charge stripe ordering in strongly underdoped La2-xSrxCuO4 single crystals

We have measured the ab-plane resistivity of La2-xSrxCuO4 single crystals w ith small Sr content (x=0.052 divided by0.075) between 4.2 and 300 K by usi ng the AC Van der Pauw technique. As recently suggested by Ichikawa et al., the deviation from the linearity of the rho (ab)(T) curve starting at a te mperature T-ch can be interpreted as due to a progressive slowing down of t he fluctuations of pre-formed charge stripes. An electronic transition of t he stripes to a more ordered phase could instead be responsible for some ve ry sharp anomalies present in the rho (ab)(T) Of Superconducting samples ju st above T-c.