Structural response to local charge order in underdoped but   superconducting La2-x(Sr,Ba)xCuO4
  We report an anomalous local structural response in the CuO2 planes associated with the appearance of charge inhomogeneities at low temperature in underdoped but superconducting La2-x(Sr,Ba)xCuO4. We used pair distribution function analysis of neutron powder diffraction data. The increase in the Cu-O bond length distribution at low temperature has an onset temperature which correlates with observations of charge and spin freezing seen by other probes. 
M. Gutmann, E. S. Bozin, and S. J. L. Billinge