Abstract.
We present high resolution X-ray measurements characterising the charge stripe order state in the La2-xSrxNiO4 system with x = 0.20, 0.225 and 0.25. We find that in the x = 0.20, 0.225 and 0.25 systems the charge stripe order exists in a charge stripe glass characterised by weak, poorly correlated incommensurate charge stripes in contrast to the strong well correlated charge stripes in the commensurate x = 1/3 system. No stabilisation of the charge order was observed at the next possible commensurate value of ε= 0.25. A comparison with high energy X-ray measurements suggested that the charge order may exist in a charge stripe glass in the bulk in the doping region x = 0.20 - 0.33. Finally at low temperature there was an initial increase in the intensity and correlation not observed with neutron measurements and it appears to be an effect that X-rays are sensitive to but neutrons are not.
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Spencer, P., Ghazi, M., Wilkins, S. et al. Charge stripe glasses in La2-xSrxNiO4 for 0.20 < x < 0.25. Eur. Phys. J. B 46, 27–32 (2005). https://doi.org/10.1140/epjb/e2005-00231-3
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DOI: https://doi.org/10.1140/epjb/e2005-00231-3