Evidences of stripe charge and spin ordering in La2NiO4+δ by electron spin resonance

In order to study the effect of oxygen doping on magnetic correlations in La2NiO4+d, electron spin resonance (ESR) measurements, which allow to characterize the spin fluctuations, have been performed on three compounds with δ = 0.09, 0.12, and 0.17. The ESR parameters anomalies are in relation with charge and spin order in stripes observed by others techniques such as neutron diffraction.

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► We measure the ESR signals in relation with stripes in La2NiO4+d compounds.
► Several samples because the ESR signals are connected with oxygen concentration.
► ESR signals allow to distinguish the interstripe and intrastripe magnetic correlations.
► ESR technique compared with other experimental detections provides good agreement.