 Wysłany: Czw 21:59, 10 Lut 2011 Temat postu: La58Ca38MnO3 system Co doping on the impact of fer |
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| La5/8Ca3/8MnO3 system Co doping on the impact of ferromagnetic localization effect of electrons
anghai200436DepartmentofPhysics, Xin: ciangTeacher ~ College, Xin. : Ciang453000 (Received29Mar &, 2005) Themagnetismandeleetriealtransportpropertiesweresystemati-eallystudiedforthestrongcorrelationmanganiteLas/sCa3/sMnl a CoO3 (= 0,oakley sunglasses,0.5) systems. Theresultsshowthatbothofthemarewithanorthorhom-bie0phasestructurebyX-raydiffractionandMnsubstitutioninducedthedecreaseofthetemperaturesoftheFerromagnetic-Paramagnetic (FM-PM) andMetal-Insulator (M ~ J) transitions. Here,uggs kopen, atypicalvalueofthepeaktemperatureTpforM ~ ltransitionsdecreasesfrom271Kto227K. And-withthedecreasesof,supra shoes outlet, decreases, theresistivityandthemagnetoresist. anceincrease. Forthepresentsamplewith5% Cosubstitution,ugg italia, acluster-glass-likebehaviorwasobservedinsteadofalong-rangeFMorderindoping-freesample. Itwasprovedthatthereexiststheelectronlocalizationeffectin-dueedbyCo-doping. FromtheMn. XI C) 2 one by one Mndoubleexchangemechanismandsuperexchangeinteractions, thecorrelationbetweenthetransportproperties, CMReffectandCosubstitutionwerealsodiscussed. Keywords: Manganite, Cosubstitution, Transportproperties, Electronloeali-rationPACC: 7200,7500.7530 E,ghd glätteisen Deutschland, 7550G, 6110 �� ThisworkissupportedbytheNationalFoundationoftheNaturalScienceofPRChina (No.10274049), TheKey-p ~ eetoftheScience & TechnologyCommitteeofShanghaiMunicipality (N0.04JC14039), theShangh ~ Nano-technologyPromotionCenterandtheScience & TechnologyCommitteeofShanghaiMunicipality ( No.0352nm036). ThisworkisalsopartlysupportedbyDownPectoftheEducationCommitteeofShanghaiMunici-pality (No.03SG35) andtheShanghaiLeadingAcademicDisciplinePrograr ~ |
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