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We investigate the crystal structure, magnetic properties, andcrystalline-electric field of tetragonal, $I4_1/amd$, NaCeO$_2$. In thiscompound, Ce$^{3+}$ ions form a tetragonally elongated diamond lattice coupledby antiferromagnetic interactions ($\Theta_{CW} = -7.69$ K) that magneticallyorder below $T_N = 3.18$ K. The Ce$^{3+}$ $J = 5/2$ crystalline-electricfield-split multiplet is studied via inelastic neutron scattering toparameterize a $J_{eff} = 1/2$ ground state doublet comprised of statespossessing mixed $|m_z \rangle$ character. Neutron powder diffraction datareveal the onset of $A$-type antiferromagnetism with $\mu=0.57(2)$ $\mu_B$moments aligned along the $c$-axis. The magnetic structure is consistent withthe expectations of a frustrated Heisenberg $J_1$-$J_2$ model on the elongateddiamond lattice with effective exchange values $J_1 > 4 J_2$ and $J_1 > 0$.

Antiferromagnetism and crystalline-electric field excitations in tetragonal NaCeO2