Ordering Process and Its Hole Concentration Dependence of the Stripe Order in La{2-x}Sr{x}NiO{4}

Abstract

Ordering process of stripe order in La{2-x}Sr{x}NiO{4} with x being around 1/3 was investigated by neutron diffraction experiments. When the stripe order is formed at high temperature, incommensurability εof the stripe order has a tendency to show the value close to 1/3 for the samples with x at both sides of 1/3. With decreasing temperature, however, εbecomes close to the value determined by the linear relation of ε= n_h, where n_h is a hole concentration. This variation of the εstrongly affects the character of the stripe order through the change of the carrier densities in stripes and antiferromagnetic domains.

5 pages, 3 figures, REVTeX, to be published in Phys. Rev. B