Zubáč Jan, Javorský Pavel, Fåk Björn
Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic.
J Phys Condens Matter. 2018 Jun 27;30(25):255801. doi: 10.1088/1361-648X/aac408. Epub 2018 May 11.
We report on inelastic neutron scattering measurements of the antiferromagnetic NdPdAl compound. NdPdAl crystallizes in the tetragonal I4/mmm space group and exhibits a distinct uniaxial anisotropy due to crystal field effects. In this study, we have revealed the crystal field energy levels of NdPdAl composed of five Kramers doublets. The corresponding four inelastic excitations are located at energies 3.0 meV, 7.4 meV, 8.6 meV and 17.1 meV. We additionally interpreted the neutron spectra within a crystal field model. It has been established that the crystal field parameters found by a Monte Carlo technique and the derived ground-state wavefunctions consisting primarily of the [Formula: see text] states reproduce correctly magnetic susceptibility data.
我们报道了反铁磁NdPdAl化合物的非弹性中子散射测量结果。NdPdAl晶体属于四方I4/mmm空间群，由于晶体场效应呈现出明显的单轴各向异性。在本研究中，我们揭示了由五个克莱默斯双重态组成的NdPdAl的晶体场能级。相应的四个非弹性激发位于能量为3.0毫电子伏、7.4毫电子伏、8.6毫电子伏和17.1毫电子伏处。我们还在晶体场模型内解释了中子能谱。已经确定，通过蒙特卡罗技术找到的晶体场参数以及主要由[公式：见正文]态组成的导出基态波函数能够正确再现磁化率数据。
