Anomalies in the ab-plane resistivity of strongly underdoped   La_{2-x}Sr_{x}CuO_{4} single crystals: possible charge stripe ordering?
  We present and discuss the results of measurements of the ab-plane resistivity of La_{2-x}Sr_{x}CuO_{4} single crystals with small Sr contents (x=0.052-0.075). The resistivity was obtained in the temperature range between 4.2 K and 300 K by using an AC Van der Pauw technique. When the temperature is lowered, the rho_{ab}(T) curves show a transition from a linear behaviour to a semiconducting-like one. The deviation from the linearity occurs at a doping-dependent temperature T_{ch}. This effect can be interpreted as due to a progressive pinning of preexistent charge stripes. In the same framework, the appearance of anomalous sharp peaks in the rho_{ab}(T) curves of superconducting samples just above T_{c} may be explained by a transition from a nematic to a more ordered smectic electronic stripe phase. 
R.S. Gonnelli, V.A. Stepanov, A. Morello, G.A. Ummarino, D. Daghero,   L. Natale, Francesca Licci and G. Ubertalli