Evidences of stripe charge and spin ordering in La_2NiO_(4+δ) by electron spin resonance

摘要

In order to study the effect of oxygen doping on magnetic correlations in La_2NiO_(4+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.