A theoretical approach is generalized and employed in this work to evaluate the magnetoresistivity of ErBi in external magnetic fields. The calculated results and theoretical analyses show that when an external magnet...A theoretical approach is generalized and employed in this work to evaluate the magnetoresistivity of ErBi in external magnetic fields. The calculated results and theoretical analyses show that when an external magnetic field is applied in the z-direction, the magnetoresistivity can be reduced considerably due to the degeneracy lifting of the crystal-field levels. However, when the magnetic field is exerted along the x-axis, the magnetoresistivity will be increased because of the formations of new magnetic states of the Er ion and its transitions within and between these new states.展开更多
We employ a two-ion model to calculate the spontaneous magnetization and susceptibility of TbNi2B2C with the mean-field theory, and derive an analytic formula for the Néel temperature of the material with the per...We employ a two-ion model to calculate the spontaneous magnetization and susceptibility of TbNi2B2C with the mean-field theory, and derive an analytic formula for the Néel temperature of the material with the perturbation theory. In both the cases, only the four lowest crystal-electric-field （CEF） states are taken into account as base functions. Our theoretical results are consistent with the experimental data, manifesting the strong effects of the low lying CEF states on the magnetic behaviors of the material and the suitability of the theoretical approach proposed here.展开更多
A two-sublattice model for rare-earth emtiferromagnets is employed to study the magnetic properties of TbNi2B2 （2. The theoretical susceptibility and magnetization curves obtained with the model show reasonable agree...A two-sublattice model for rare-earth emtiferromagnets is employed to study the magnetic properties of TbNi2B2 （2. The theoretical susceptibility and magnetization curves obtained with the model show reasonable agreement with the experimental results.展开更多
基金Supported by the Natural Science Foundation of Jiangsu Province under Grant No BK2008438, and the Research Plan MSM of the Ministry of Education of the Czech Republic under Grant No 0021620834.
文摘A theoretical approach is generalized and employed in this work to evaluate the magnetoresistivity of ErBi in external magnetic fields. The calculated results and theoretical analyses show that when an external magnetic field is applied in the z-direction, the magnetoresistivity can be reduced considerably due to the degeneracy lifting of the crystal-field levels. However, when the magnetic field is exerted along the x-axis, the magnetoresistivity will be increased because of the formations of new magnetic states of the Er ion and its transitions within and between these new states.
基金Supported by the Natural Science Foundation of Jiangsu Province under Grant No BK2008438, and the Ministry of Education of the Czech Republic under Grant No MSM-0021620834.
文摘We employ a two-ion model to calculate the spontaneous magnetization and susceptibility of TbNi2B2C with the mean-field theory, and derive an analytic formula for the Néel temperature of the material with the perturbation theory. In both the cases, only the four lowest crystal-electric-field （CEF） states are taken into account as base functions. Our theoretical results are consistent with the experimental data, manifesting the strong effects of the low lying CEF states on the magnetic behaviors of the material and the suitability of the theoretical approach proposed here.
基金Supported by the Natural Science Foundation of Jiangsu Province under Grant No BK2008438, and the Ministry of Education of the Czech Republic under Grant No MSM 0021620834.
文摘A two-sublattice model for rare-earth emtiferromagnets is employed to study the magnetic properties of TbNi2B2 （2. The theoretical susceptibility and magnetization curves obtained with the model show reasonable agreement with the experimental results.
