3968

3746

كارشناسي ارشد

فيزيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك

1386

نه، 108، [II]ص.: مصور، جدول، نمودار

ص. ع. به فارسي و انگليسي

1396/03/08

كتابنامه

فيزيك

فيزيك

ID3746

به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال

AbstractIn this study the effect of Mg substitution on the structural magnetic and electricalproperties of La0 75Sr0 25 xMgxMnO3 nominal composition are investigated by XRD Ac susceptibility and electrical resistivity measurements The results show that byincreasing Mg doping level the paramagnetic ferromagnetic and metal insulatortransition temperatures decreases and reentrant spin glass observed in heavily dopedsamples The reason for decreasing transition temperatures with increasing Mgconcentration is that Mg ion substitutes Mn site and not the La site thus the longrange FM order was destroyed by the Mg randomly occupying Mn site which leadsto the suppression of double exchange interaction in the Mn3 O Mn4 network

پرويز كاملي

هادي سلامتي

مهدي صفا اصفهاني، جواد هاشمي فر