Departamento Física Aplicada, EPS, Universidad Carlos III, Madrid, Spain.
J Phys Condens Matter. 2012 Feb 22;24(7):076003. doi: 10.1088/0953-8984/24/7/076003. Epub 2012 Jan 18.
The long-range magnetic ordering of PrMn(2)O(5) has been studied on polycrystalline samples from neutron diffraction and specific heat measurements. The onset of antiferromagnetic ordering is observed at T(N) ≈ 25 K. In the temperature interval 18 K < T < 25 K the magnetic structure is defined by the propagation vector k(1) = (1/2,0,0). Below 18 K, some additional magnetic satellites appear in the NPD patterns, which are indexed with k(2) = (0,0,1/2). Therefore, below 18 K the magnetic structure consists of two independent magnetic domains, defined by the propagation vectors k(1) and k(2). The magnetic structure of the k(1)-domain is given by the basis vectors (C(x),0,0) and (C(x)',0,0) for Mn(4h) and Mn(4f), respectively. In the k(2)-domain, the magnetic structure is defined by the basis vectors (0,0,G(z)) and (F(x)',G(y)',0) for Mn(4h) and Mn(4f), respectively. At T = 1.5 K, for the magnetic phase associated with k(1), the magnetic moments of the Mn atoms at the 4h and 4f sites are 1.82(7) and 1.81(6) μ(B), respectively; for the magnetic phase associated with k(2), the magnetic moments for the Mn(4h) and Mn(4f) atoms are 0.59(5) and 2.62(5) μ(B), respectively.
PrMn(2)O(5) 的长程磁有序已通过多晶样品的中子衍射和比热测量进行了研究。反铁磁有序的起始温度 T(N)≈25 K。在 18 K<T<25 K 的温度区间内，磁结构由传播矢量 k(1)=(1/2,0,0) 确定。在 18 K 以下，NPD 图谱中出现了一些额外的磁卫星，它们用 k(2)=(0,0,1/2) 索引。因此，在 18 K 以下，磁结构由传播矢量 k(1)和 k(2)定义的两个独立磁畴组成。k(1)-畴的磁结构由基矢 (C(x),0,0) 和 (C(x)’,0,0) 给出，分别对应于 Mn(4h) 和 Mn(4f)。在 k(2)-畴中，磁结构由基矢 (0,0,G(z)) 和 (F(x)’,G(y)’,0) 给出，分别对应于 Mn(4h) 和 Mn(4f)。在 T=1.5 K 时，对于与 k(1)相关的磁相，4h 和 4f 位 Mn 原子的磁矩分别为 1.82(7) 和 1.81(6) μB；对于与 k(2)相关的磁相，Mn(4h) 和 Mn(4f)原子的磁矩分别为 0.59(5) 和 2.62(5) μB。
