Static and fluctuating stripe order observed by resonant soft x-ray diffraction in La1.8Sr0.2NiO4

Details Static and fluctuating stripe order observed by resonant soft x-ray diffraction in La1.8Sr0.2NiO4 Static and fluctuating stripe order observed by resonant soft x-ray diffraction in La1.8Sr0.2NiO4

2009-03-05

arxiv.org/abs/0903.0994v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We studied the stripe phase of La1.8Sr0.2NiO4 using neutron diffraction, resonant soft x-ray diffraction (RSXD) at the Ni L2,3 edges, and resonant x-ray diffraction (RXD) at the Ni K threshold. Differences in the q-space resolution of the different techniques have to be taken into account for a proper evaluation of diffraction intensities associated with the spin and charge order superstructures. We find that in the RSXD experiment the spin and charge order peaks show the same temperature dependence. In the neutron experiment by contrast, the spin and charge signals follow quite different temperature behaviors. We infer that fluctuating magnetic order contributes considerably to the magnetic RSXD signal and we suggest that this result may open an interesting experimental approach to search for fluctuating order in other systems by comparing RSXD and neutron diffraction data.

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