Magnetic phase diagrams of L1-xAxMnO3 manganites (L = Pr,Sm; A = Ca,Sr)
Magnetic phase diagrams of L1-xAxMnO3 manganites (L = Pr,Sm; A = Ca,Sr)
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DOI：
10.1103/physrevb.60.12191
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发表时间：
1999-11-01
影响因子：
3.7
通讯作者：
Raveau, B
中科院分区：
文献类型：
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作者：
Martin, C;Maignan, A;Raveau, B
结合中子衍射、电子显微镜和磁输运测量建立了四个L（1-x）A（x）MnO（3）系列（L=Pr，Sm; A = Ca，Sr）的磁相图，以了解和优化这些化合物的庞磁电阻（CMR）性质。还进行了La 1-xCaxMnO 3相图（x大于或等于0.8）的补充研究。这些图的比较表明，需要低的[r（A）]值以在富Mn 4+侧获得CMR性质，即，当电荷有序与团簇玻璃相发生竞争时（L_（1-x）Ca_xMnO_3; L= Pr，Sm），由于富Mn ~（3+）侧的[r（A）]值较低（x
The magnetic phase diagrams of four L(1-x)A(x)MnO(3) series (L=Pr,Sm; A = Ca,Sr) have been established combining neutron diffraction, electron microscopy, and magnetotransport measurements in order to understand and optimize the colossal magnetoresistance (CMR) properties of these compounds. A complementary study of the La1-xCaxMnO3 phase diagram (x greater than or equal to 0.8) is also performed. The comparison of these diagrams demonstrates that low [r(A)] values are required to obtain CMR properties on the Mn4+ rich side, i.e., when a competition between charge order and cluster glass phases occurs (L1-xCaxMnO3; L= Pr,Sm), As a consequence of the low [r(A)] values on the rich Mn3+ side (x