Antiferromagnetism and crystalline-electric field excitations in tetragonal NaCeO2

Abstract

We investigate the crystal structure, magnetic properties, and crystalline-electric field of tetragonal, $I{4}_1/amd$, NaCeO${}_2$. In this compound, Ce${}^{3+}$ ions form a tetragonally elongated diamond lattice coupled by antiferromagnetic interactions (${\Theta }_{CW}=-7.69$ 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 $|m_z⟩$ character. Neutron powder diffraction data reveal the onset of $A$-type antiferromagnetism with $\mu =0.57(2)$ ${\mu }_B$ 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 $J_1>4J_2$ and $J_1>0$.

7 pages, 6 figures

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• Electronic structure of the frustrated diamond lattice magnet NiRh${}_2$O${}_4$
• Crystal-field effects competing with spin-orbit interactions in NaCeO${}_2$
• Dominant Kitaev interaction and field-induced quantum phase transitions in triangular-lattice KCeSe2
• Explaining the extra crystal field mode in ACeX2
• Magnetoelastic coupling in the stretched diamond lattice of TbTaO${}_4$
• High-pressure synthesis of quantum magnet M-YbTaO4 with a stretched diamond lattice
• Frustrated $J_1-J_2$ Diamond Lattice Antiferromagnet Co${}_2$Ti${}_3$O${}_8$ with a Vacancy-ordered Spinel Structure Synthesized via a Topochemical Reaction