Origin of the Downturn in Inverse Susceptibility Observed above the Curie Temperature in Perovskite Manganites-中国期刊网

摘要 Themeasurementoflow-fieldsusceptibilityXasafunctionoftemperatureTforLa2/3Ca1/3MnO3showsasignificantdownturnin1/X(T)abovetheCurietemperatureTc,abehaviourgenerallyobservedinperovskitemanganites.Suchadownturnisarguedtobeduetothesegregationofferromagneticclusterswithlargerspinsintheparamagneticmatrix.Basedonthisconsideration,aphenomenologicalexpressionforX(T)isproposed,inwhichthetotalsusceptibilityisassumedtobeasumoftwosusceptibilitiesarisingfrommagneticentitiesinthePMbackgroundandtheFMclusterswithT-dependenteffectivespins,respectively.TheresultisingoodagreementwiththeexperimentaldataobtainedinLa2/3Ca1/3MnO3.

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Origin of the Downturn in Inverse Susceptibility Observed above the Curie Temperature in Perovskite Manganites

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Origin of the Downturn in Inverse Susceptibility Observed above the Curie Temperature in Perovskite Manganites

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