Crystal Structure and Magnetic Properties of RCu4Ag (R = Rare Earth) Intermetallic Compounds
Crystal Structure and Magnetic Properties of RCu4Ag (R = Rare Earth) Intermetallic Compounds
复制标题
RCu4Ag（R = 稀土）金属间化合物的晶体结构和磁性
DOI：
10.1063/1.2946083
复制
发表时间：
1976
期刊：
影响因子：
--
通讯作者：
W. Wallace
中科院分区：
文献类型：
--
作者：
T. Takeshita;S. Malik;A. A. El‐Atttar;W. Wallace
RCu5金属间化合物以立方AuBe5型结构或六方CaCu5结构结晶，具体取决于所涉及的稀土离子。研究了银取代一铜对RCu5化合物结构稳定性的影响。观察到化合物RCu4Ag (R = ND to TM)为AuBe5型结构。在4.2K到300K的温度范围内，在高达21kOe的磁场中，研究了这些化合物的R- = 、ND和Ho的磁化强度。发现含有Nd、Sm、Gd和Tb的化合物具有反铁磁性，Neel温度分别为7、7、9和16.5K。Dy和Ho化合物在大于约1Koe的磁场中表现出铁磁行为。在顺磁区，除SmCu4Ag外，其余化合物的磁化率均服从居里-魏斯定律。这些化合物的顺磁性居里温度可以用RKKY理论来解释，并选择合适的居里温度参数。
The RCu5 intermetallic compounds crystallize either in the cubic AuBe5 type structure or in the hexagonal CaCu5 structure depending upon the particular rare earth ion involved. The effect of substituting Ag for one Cu on the structure stability of RCu5 compounds has been investigated. It is observed that the compounds RCu4Ag (R = Nd to Tm) crystallize in the AuBe5 type structure. The magnetization of these compounds with R = Nd to Ho has been studied in temperature range 4.2 to 300 K and in magnetic fields up to 21 kOe. The compounds with Nd, Sm, Gd and Tb are found to order antiferromagnetically with Neel temperature of 7, 7, 9 and 16.5 K, respectively. The Dy and Ho compounds exhibit ferromagnetic behavior in magnetic fields larger than about 1 kOe. In the paramagnetic region, the magnetic susceptibility of all the compounds except that of SmCu4Ag follows the Curie‐Weiss law. The paramagnetic Curie temperatures of these compounds can be explained on the basis of RKKY theory with a suitable choice of the...