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We have studied the magnetization of a series of spin-charge orderedLa(2-x)Sr(x)NiO(4+delta) single crystals with 0 < x < 0.5. For fields appliedparallel to the ab plane there is a large irreversibility below a temperatureT(F1) ~ 50 K and a smaller irreversibility that persists up to near the chargeordering temperature. We observed a novel memory effect in the thermo-remnantmagnetization across the entire doping range. We found that these materialsretain a memory of the temperature at which an external field was removed, andthat there is a pronounced increase in the thermo-remnant magnetization whenthe system is warmed through a spin reorientation transition

physical review. b, condensed matter and materials physics

Magnetization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="normal">Ni</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:…

Magnetization ofLa2−xSrxNiO4+δ