La(5/8 - y)Nd(y)Ca(3/8)MnO(3) 锰酸盐的相图。
Phase diagram of La(5/8-y)Nd(y)Ca(3/8)MnO(3) manganites.
作者信息
Sacanell J, Levy P, Leyva A G, Parisi F, Ghivelder L
机构信息
Departamento de Física, Centro Atómico Constituyentes, CNEA, Avenida General Paz 1499 (1650), San Martín, Provincia de Buenos Aires, Argentina.
出版信息
J Phys Condens Matter. 2007 May 8;19(18):186226. doi: 10.1088/0953-8984/19/18/186226. Epub 2007 Apr 12.
We report a detailed study of the electric transport and magnetic properties of the La(5/8-y)Nd(y)Ca(3/8)MnO(3) manganite system. Substitution of La(3+) by smaller Nd(3+) ions reduces the mean ionic radius of the A-site ion. We have studied samples in the entire range between La-rich and Nd-rich compounds (0.1<y<0.625). Results of dc magnetization and resistivity show that doping destabilizes the ferromagnetic (FM) character of the pure La compound and triggers the formation of a phase-separated state at intermediate doping. We have also found evidence of a dynamical behaviour within the phase-separated state. A phase diagram is constructed, summarizing the effect of chemical substitution on the system.
我们报告了对La(5/8 - y)Nd(y)Ca(3/8)MnO₃锰氧化物体系的电输运和磁性的详细研究。用较小的Nd³⁺离子取代La³⁺会降低A位离子的平均离子半径。我们研究了富La化合物和富Nd化合物之间整个范围内的样品（0.1 < y < 0.625）。直流磁化和电阻率结果表明，掺杂会破坏纯La化合物的铁磁（FM）特性，并在中间掺杂时引发相分离态的形成。我们还发现了相分离态内动力学行为的证据。构建了一个相图，总结了化学取代对该体系的影响。
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