（139）La（1-x）Ca（x）MnO（3）中准静态轨道有序化的核磁共振研究。
(139)La NMR investigation of quasistatic orbital ordering in La(1-x)Ca(x)MnO(3).
作者信息
Papavassiliou G, Belesi M, Fardis M, Dimitropoulos C
机构信息
Institute of Materials Science, National Center for Scientific Research Demokritos, 153 10 Athens, Greece.
出版信息
Phys Rev Lett. 2001 Oct 22;87(17):177204. doi: 10.1103/PhysRevLett.87.177204. Epub 2001 Oct 4.
We report (139)La nuclear magnetic resonance in ferromagnetic and insulating (FMI) La(1-x)Ca(x)MnO(3), 0.10< or =x< or =0.20, which at low temperatures shows the formation of Mn octants with enhanced Mn-O wave function overlapping and electron-spin alignment. The rapid increase of the relaxation rates and the "wipeout" of the (139)La NMR signal intensity on heating, imply a quasistatic character for the Mn octant cells in the FMI phase, which freeze below a transition temperature T(f).
我们报道了铁磁绝缘（FMI）的La(1-x)Ca(x)MnO(3)（0.10≤x≤0.20）中的（139）La核磁共振，该材料在低温下显示出Mn八分体的形成，其Mn-O波函数重叠增强且电子自旋排列有序。加热时弛豫率的快速增加以及（139）La NMR信号强度的“消失”，意味着FMI相中Mn八分体单元具有准静态特性，它们在转变温度T(f)以下冻结。
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