Peculiar magnetization process and magnetism of PrCu_2Ge_2

该四方三元化合物表现出特殊的磁化过程和磁化率的温度依赖性。这项工作是为了理解这种磁性行为。1)这种特殊的行为是这种化合物的固有性质，因为一些单晶也表现出同样的行为。2)电阻率在4 K左右表现出滞后和快速变化，表明一阶磁性转变。在4k处的跃迁是一个反铁磁-反铁磁的跃迁，一个简单的反铁磁结构改变了一个不相称的长程周期结构。4)从比热的测量，磁熵估计为Rln2到TN，表明基态是一个重态。超精细场距低温比热约为3moe，与pr1相当。这些结果将于2004年7月在德国卡尔斯鲁厄举行的强相关电子系统国际会议上发表

The tetragonal ternary compound shows a peculiar magnetization process and temperature dependence of magnetic susceptibility. This work has been performed to understand this magnetic behavior1) This peculiar behavior is intrinsic nature for this compound because some single crystals made show the same behavior2) The electrical resistivity shows a hysteresis and rapid change around 4 K, indicating the first order magntic transition3) From neutron diffraction study, the transition at 4 K is an antiferromagnetic-antiferromagnetic transition where a simple antiferromagnetic structure changes a incommensurate long-range period structure4) From measurement of specific heat, magnetic entropy is estimated to be Rln2 until TN, indicating that the ground state is a doublet. Hyperfine field is also estimated to be 3 Moe from low temperature specific heat which is comparable to one in PrThese results will be presented at the International Conference on Strongly Correlated Electron Systems in July 2004 at Karlsruhe, Germany