La_(0.5)Eu_(0.2)Sr_(0.3)MnO_3钙钛矿型锰氧化物的^(151)Eu穆斯堡尔效应

Study on the Mssbauer spectroscopy of LLa_(0.5)Eu_(0.2)Sr_(0.3)MnO_3 manganese oxides

利用穆斯堡尔效应研究了A位La被Eu替代的锰氧化物La0.5Eu0.2Sr0.3MnO3和La0.4Eu0.3Sr0.3MnO3的磁性、导电性、磁电阻效应。一定比例的Eu掺杂能够使La0.7Sr0.3MnO3样品出现M-I转变。穆斯堡尔参数表明在250 K附近存在一种磁结构转变;高温区T>260 K时,θD=120 K,低温区T<360 K时,θD=260 K。

The magnetism, conductivity and magnetoelectricity resistance effect of manganese oxides whose A position La is replaced by Eu such as La0.5Eu0.2Sr0.3MnO3 and La0.4Eu0.3Sr0.3MnO3 are studied with the M o ssbauer spectroscopy. Results show that proportional adulteration can make La0.7Sr0.3 MnO3 have the M-I transition. The M o ssbauer parameters indicate that one structure is transferred at 250 K, θD is 120 K when T〉260 K while θD is 260 K when T〈360 K.