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首页> 外文期刊>International Journal of Quantum Chemistry >Magnetic structures of the rare-earth platinum aluminides RPtAl (R = Ce, Pr, Nd)
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Magnetic structures of the rare-earth platinum aluminides RPtAl (R = Ce, Pr, Nd)

机译：稀土铂铝化物RPtAl（R = Ce，Pr，Nd）的磁性结构

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摘要

The rare-earth (R) platinum aluminides RPtAl crystallize in the orthorhombic TiNiSi-type structure (space group Pnma, Z = 4), where magnetic rare-earth atoms form a network of chains parallel to the a-axis and parallel to the b-axis. Magnetic structures and phase transitions of RPtAl (R = Ce, Pr, Nd) compounds were investigated by systematic measurements of magnetic susceptibility, specific heat, and neutron diffraction on polycrystalline samples. The results reveal a large magnetocrystalline anisotropy and magnetic structures that are dominated by a ferromagnetic component parallel to one of the two chain directions: the a-axis for CePtAl and PrPtAl and the b-axis for NdPtAl. The complex magnetism of CePtAl with three successive magnetic phase transitions (T-C = 5.9 K, T-2 = 4.3 K, T-3 = 2.5 K) and two coexisting propagation vectors (k(1) = 0 for T less than or equal to T-C, k(2i) = [0, 0.46, 0] for T-2 less than or equal to T less than or equal to T-C, k(2) = [0, 1/2, 0] for T less than or equal to T-2) is confirmed to be exceptional among RPtAl compounds. PrPtAl has a nonmagnetic crystalline-electric field (CEF) ground-state singlet separated by 21 K from the first-excited state CEF singlet and magnetic exchange interactions are strong enough to induce long-range magnetic order (Curie temperature T-C = 5.8 K, propagation vector k(1) = 0, magnetic group Pnm'a', ordered saturation moment m(1) = 1.00(7) mu(B)). NdPtAl is a simple ferromagnet (T-C = 19.2 K, k(1) = 0, Pn'ma', m(1) = 2.08(4) mu(B)). (C) 1998 Academic Press. [References: 15]
机译：稀土（R）铂铝化物RPtAl以正交TiNiSi型结构（空间群Pnma，Z = 4）结晶，其中磁性稀土原子形成一个平行于a轴且平行于b的链网络-轴。通过系统地测量多晶样品上的磁化率，比热和中子衍射，研究了RPtAl（R = Ce，Pr，Nd）化合物的磁性结构和相变。结果表明，大的磁晶各向异性和磁性结构由平行于两个链向之一的铁磁成分所主导：CePtAl和PrPtAl的a轴和NdPtAl的b轴。 CePtAl的复磁性具有三个连续的磁相变（TC = 5.9 K，T-2 = 4.3 K，T-3 = 2.5 K）和两个共存的传播矢量（T（t）小于或等于k（1）= 0）对于小于或等于T的T-2，TC，k（2i）= [0，0.46，0]对于小于或等于T的T-2，k（2）= [0，1/2，0]在RPtA1化合物中，T2等于T-2）被证实是例外。 PrPtAl具有一个非磁性晶体电场（CEF）基态单峰，与第一激发态CEF单峰相距21 K，并且磁交换相互作用足够强，可以诱导远距离磁阶（居里温度TC = 5.8 K，传播向量k（1）= 0，磁性Pnm'a'，有序饱和矩m（1）= 1.00（7）mu（B））。 NdPtAl是一种简单的铁磁体（T-C = 19.2 K，k（1）= 0，Pn'ma'，m（1）= 2.08（4）mu（B））。 （C）1998年学术出版社。 [参考：15]

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