Charge stripe glasses in La 2-x Sr x NiO 4 for 0.20 > x > 0.25

P. D. Spencer, M. E. Ghazi, S. B. Wilkins, P. D. Hatton (), S. D. Brown, D. Prabhakaran and A. T. Boothroyd

The European Physical Journal B: Condensed Matter and Complex Systems, 2005, vol. 46, issue 1, 27-32

Abstract: We present high resolution X-ray measurements characterising the charge stripe order state in the La 2-x Sr x NiO 4 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. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Date: 2005
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DOI: 10.1140/epjb/e2005-00231-3

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