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Abstract
The effect of Cu doping on the stripe-ordered state in La1.67Sr0.33NiO4 has been studied by means ofelectrical resistivity and magnetic measurements andtransmission electron microscopy observation. Theinvestigations reveal that Cu doping at Ni sites does not changethe modulation pattern of the charge ordering, but clearlyreduces the charge-ordered-transition and spin-orderingtemperatures. Moreover, Cu on the NiO2 planes tends to meltthe stripe lattice and reduce the charge and spin stripecorrelation lengths. These effects could arise from thecooperative action of carrier mobility enhancement, stronginterplay of Cu spins with the host Ni spin-lattice system, andthe disordering effect of Cu dopants.
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