论文标题
四方NACEO2中的抗铁磁性和结晶电场激发
Antiferromagnetism and crystalline-electric field excitations in tetragonal NaCeO2
论文作者
论文摘要
我们研究了四方的晶体结构，磁性和晶体电场，$ i4_1/amd $，naceo $ _2 $。在这种化合物中，CE $^{3+} $离子形成了一个四延长的钻石晶格，并通过防铁磁相互作用（$θ_{cw} = -7.69 $ k），磁性下订购$ t_n = 3.18 $ k。非弹性中子散射以参数化$ j_ {eff} = 1/2 $地面状态双重doublet，该状态由具有混合$ | m_z \ rangle $ targue的状态组成。中子粉末衍射数据揭示了$ a $ type抗铁磁性的发作，$μ= 0.57（2）$ $ $ $μ_b$矩矩沿$ c $轴对齐。磁性结构与沮丧的Heisenberg $ J_1 $ - $ J_2 $模型的期望是一致的，具有有效交换值$ J_1> 4 J_2 $和$ J_1> 0 $。
We investigate the crystal structure, magnetic properties, and crystalline-electric field of tetragonal, $I4_1/amd$, NaCeO$_2$. In this compound, Ce$^{3+}$ ions form a tetragonally elongated diamond lattice coupled by antiferromagnetic interactions ($Θ_{CW} = -7.69$ K) that magnetically order below $T_N = 3.18$ K. The Ce$^{3+}$ $J = 5/2$ crystalline-electric field-split multiplet is studied via inelastic neutron scattering to parameterize a $J_{eff} = 1/2$ ground state doublet comprised of states possessing mixed $|m_z \rangle$ character. Neutron powder diffraction data reveal the onset of $A$-type antiferromagnetism with $μ=0.57(2)$ $μ_B$ moments aligned along the $c$-axis. The magnetic structure is consistent with the expectations of a frustrated Heisenberg $J_1$-$J_2$ model on the elongated diamond lattice with effective exchange values $J_1 > 4 J_2$ and $J_1 > 0$.
