Peculiar magnetization process and magnetism of PrCu_2Ge_2

该化合物具有独特的磁化过程和磁化率的温度依赖性。1）这种特殊的行为是这种化合物的固有性质，因为一些单晶显示出相同的行为2）电阻率在4K附近显示出滞后和快速变化，表明一级磁性转变3）从中子衍射研究中，在4K的转变是反铁磁-反铁磁转变，其中简单的反铁磁结构改变了无公度的长程周期结构。4）从比热的测量，磁熵被估计为Rln 2直到TN，表明基态是一个双重态。超精细场也估计为3莫伊，低温比热与Pr相当。这些结果将在2004年7月在德国卡尔斯鲁厄举行的强关联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