Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, PL-00 681 Warsaw, Poland.
J Phys Condens Matter. 2010 May 12;22(18):186001. doi: 10.1088/0953-8984/22/18/186001. Epub 2010 Apr 15.
Low temperature atomic position modulations and magnetic moment modulations are reported for CaCu(x)Mn(7 - x)O(12) (x = 0.0, 0.1 and 0.23) using neutron powder diffraction. Both modulations are described with propagation vectors (0, 0, q) parallel to the c-axis in the hexagonal setting. The present neutron diffraction studies confirm the quantitative model describing the atomic position modulations in CaCu(x)Mn(7 - x)O(12) (x = 0.0 and 0.1) as derived from synchrotron based powder x-ray diffraction studies (Sławiński et al 2009 Acta Crystallogr. B 65 535). Neutron diffraction studies confirm the relation between the atomic position modulation length L(p) and the magnetic modulation length L(m) = 2L(p) between 50 K and the Néel temperature T(N). CaCu(x)Mn(7 - x)O(12) (x = 0.1 and 0.23) shows a magnetic phase transition near 50 K associated with considerable changes of the magnetic modulation length and the magnetic coherence length, similar to that observed in the parent CaMn(7)O(12).
利用中子粉末衍射，报道了 CaCu(x)Mn(7 - x)O(12)（x = 0.0、0.1 和 0.23）中低温原子位置调制和磁矩调制。这两种调制都用沿 c 轴平行的传播矢量（0，0，q）来描述，在六方晶系中。目前的中子衍射研究证实了定量模型描述的 CaCu(x)Mn(7 - x)O(12)（x = 0.0 和 0.1）中的原子位置调制，该模型源自基于同步加速器的粉末 x 射线衍射研究（Sławiński 等人，2009 年 Acta Crystallogr. B 65,535）。中子衍射研究证实了原子位置调制长度 L(p)与磁调制长度 L(m) = 2L(p)之间的关系，该关系存在于 50 K 到奈尔温度 T(N)之间。CaCu(x)Mn(7 - x)O(12)（x = 0.1 和 0.23）在 50 K 附近表现出磁相变，与观察到的母体 CaMn(7)O(12)类似，磁调制长度和磁相干长度有相当大的变化。
