等原子CeAl的晶体生长和磁性
Crystal growth and magnetic properties of equiatomic CeAl
摘要：
采用Ce-Al自熔剂法生长了CeAl单晶。获得了几个针状单晶，针状单晶的长度对应于[001]晶体学方向。X射线粉末衍射分析表明，CeAl为正交CrB型结构，空间群为${Cmcm}$（no.63）。通过磁化率、等温磁化强度、电输运和热容测量研究了其磁性。发现CeAl是反铁磁有序的，N $\grave{\rm e}$ el温度为$T_{\rm N}$ = 10 K.低于有序化温度的磁化强度数据揭示了两个超磁转变小于20 kOe的领域。根据磁化率的倒数估算了$2.66μ_{\rm B}$ /Ce的有效磁矩，表明Ce处于三价态。电阻率数据清楚地显示了急剧下降，在10 K由于自旋无序散射的导电电子的减少，从而确认磁有序。估计的剩余电阻率比（RRR）为33，因此表明单晶的质量良好。的磁有序的散装性质也证实了热容数据。根据热容的Schottky反常，我们估算了$(2J+1)$简并基态的第一和第二激发态的晶场能级分裂能分别为25 K和175 K。
英文摘要：
Single crystal of CeAl has been grown by flux method using Ce-Al self-flux. Several needle like single crystals were obtained and the length of the needle corresponds to the [001] crystallographic direction. Powder x-ray diffraction revealed that CeAl crystallizes in orthorhombic CrB-type structure with space group ${Cmcm}$ (no. 63). The magnetic properties have been investigated by means of magnetic susceptibility, isothermal magnetization, electrical transport, and heat capacity measurements. CeAl is found to order antiferromagnetically with a N$\grave{\rm e}$el temperature $T_{\rm N}$ = 10K. The magnetization data below the ordering temperature reveals two metamagentic transitions for fields less than 20kOe. From the inverse magnetic susceptibility an effective moment of $2.66μ_{\rm B}$/Ce has been estimated, which indicates that Ce is in its trivalent state. Electrical resistivity data clearly shows a sharp drop at 10K due to the reduction of spin disorder scattering of conduction electrons thus confirming the magnetic ordering. The estimated residual resistivity ratio (RRR) is 33, thus indicating a good quality of the single crystal. The bulk nature of the magnetic ordering is also confirmed by heat capacity data. From the Schottky anomaly of the heat capacity we have estimated the crystal field level splitting energies of the $(2J+1)$ degenerate ground state as 25K and 175K respectively for the fist and second excited states.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
