论文标题

rbcex $ _2 $的电子和结构属性(x $ _2 $:o $ _2 $,s $ _2 $,ses,se $ _2 $,tese,tese,te $ _2 $)

Electronic and structural properties of RbCeX$_2$ (X$_2$: O$_2$, S$_2$, SeS, Se$_2$, TeSe, Te$_2$)

论文作者

Ortiz, Brenden R., Bordelon, Mitchell M., Bhattacharyya, Pritam, Pokharel, Ganesh, Sarte, Paul M., Posthuma, Lorenzo, Petersen, Thorben, Eldeeb, Mohamed S., Granroth, Garrett E., Cruz, Clarina R. Dela, Calder, Stuart, Abernathy, Douglas L., Hozoi, Liviu, Wilson, Stephen D.

论文摘要

由磁性灯笼离子构建的三角形晶格Delafossite化合物由于其沮丧的磁性和实现量子无序的磁接地状态而引起了人们的关注。在这里,我们报告了rbce $ x_2 $化合物的结构和电子接地状态的演变,该化合物是由CE $^{3+} $ ions的三角形晶格($ x_2 $ = O $ _2 $,s $ _2 $,s $ _2 $,SES,SES,SES,SE $ _2 $,SE $ _2 $,TESE $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $)。这包括发现本系列的新成员RBCEO $ _2 $,该系列可能实现了类似于Naybo $ _2 $的量子失调的基态。 Magnetization and susceptibility measurements reveal that all compounds manifest mean-field antiferromagnetic interactions and, with the exception of the oxide, possess signatures of magnetic correlations onset below 1 K. The crystalline electric field level scheme is explored via neutron scattering and \textit{ab initio} calculations in order to model the intramultiplet splitting of the $J=5/2$ multiplet.除了在$ j = 5/2 $歧管内预期的两个激发双重运动员外,我们还观察到整个示例系列中存在一个额外的本地模式。这种增加的模式随着阴离子质量的增加和晶体场强度的降低而向下移动,这表明阴离子运动的长期异常模式涉及CE $^{3+} $位点。

Triangular lattice delafossite compounds built from magnetic lanthanide ions are a topic of recent interest due to their frustrated magnetism and realization of quantum disordered magnetic ground states. Here we report the evolution of the structure and electronic ground states of RbCe$X_2$ compounds, built from a triangular lattice of Ce$^{3+}$ ions, upon varying their anion character ($X_2$= O$_2$, S$_2$, SeS, Se$_2$, TeSe, Te$_2$). This includes the discovery of a new member of this series, RbCeO$_2$, that potentially realizes a quantum disordered ground state analogous to NaYbO$_2$. Magnetization and susceptibility measurements reveal that all compounds manifest mean-field antiferromagnetic interactions and, with the exception of the oxide, possess signatures of magnetic correlations onset below 1 K. The crystalline electric field level scheme is explored via neutron scattering and \textit{ab initio} calculations in order to model the intramultiplet splitting of the $J=5/2$ multiplet. In addition to the two excited doublets expected within the $J=5/2$ manifold, we observe one extra, local mode present across the sample series. This added mode shifts downward in energy with increasing anion mass and decreasing crystal field strength, suggesting a long-lived anomalous mode endemic to anion motion about the Ce$^{3+}$ sites.

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