Magnetic properties and signatures of moment ordering in triangular lattice antiferromagnet KCeO${}_2$

Abstract

The magnetic ground state and the crystalline electric field level scheme of the triangular lattice antiferromagnet KCeO${}_2$ are investigated. Below $T_N=$ 300 mK, KCeO${}_2$ develops signatures of magnetic order in specific heat measurements and low energy inelastic neutron scattering data. Trivalent Ce${}^{3+}$ ions in the $D_{3d}$ local environment of this compound exhibit large splittings among the lowest three $4f^1$ Kramers doublets defining for the free ion the $J=5/2$ sextet and a ground state doublet with dipole character, consistent with recent theoretical predictions in M. S. Eldeeb et al. Phys. Rev. Materials 4, 124001 (2020). An unexplained, additional local mode appears, and potential origins of this anomalous mode are discussed.

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• Double magnetic transitions and exotic field induced phase in the triangular lattice antiferromagnets Sr${}_3$Co(Nb,Ta)${}_2$O${}_9$
• Exchange renormalized crystal field excitation in a quantum Ising magnet KTmSe${}_2$
• Stripe magnetic order and field-induced quantum criticality in the perfect triangular-lattice antiferromagnet CsCeSe${}_2$
• Electronic and structural properties of RbCeX${}_2$ (X${}_2$: O${}_2$, S${}_2$, SeS, Se${}_2$, TeSe, Te${}_2$)
• Stripe order and spin dynamics in triangular-lattice antiferromagnet KErSe${}_2$: A single-crystal study with a theoretical description
• Magnetic properties of a spin-orbit entangled Jeff = 1/2 honeycomb lattice
• Crystal-field effects competing with spin-orbit interactions in NaCeO${}_2$
• Dominant Kitaev interaction and field-induced quantum phase transitions in triangular-lattice KCeSe2
• Yb${}^{3+}$ $f$-$f$ excitations in NaYbSe${}_2$: benchmarking embedded-cluster quantum chemical schemes for 4$f$ insulators
• Explaining the extra crystal field mode in ACeX2
• Localized fermions on the triangular lattice with Ising-like interactions
• Magnetic anisotropy and dipolar interactions in the frustrated triangular-lattice magnet NaGdS_2
• 5d-mediated indirect exchange and effective spin Hamiltonians in Ce triangular-lattice delafossites