Eur. Phys. J. B 46, 27-32 (2005)
https://doi.org/10.1140/epjb/e2005-00231-3

Charge stripe glasses in La_2-xSr_xNiO₄ for 0.20 < x < 0.25

¹ Department of Physics, University of Durham, Rochester Building, South Road, Durham, DH1 3LE, UK
² Physics Department, Shahrood University of Technology, Shahrood, PO BOX 36155-316, Iran
³ European Commission, Joint Research Center, Institute for Transuranium Elements, Hermann von Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
⁴ European Synchrotron Radiation Facility, 38043 Grenoble Cedex, France
⁵ Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, UK

Corresponding author: ^a p.d.hatton@dur.ac.uk

Received: 13 August 2004
Revised: 22 April 2005
Published online: 8 August 2005

Abstract

We present high resolution X-ray measurements characterising the charge stripe order state in the La_2-xSr_xNiO₄ 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 . 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.