Crystal field Hamiltonian and anisotropy in KErSe2 and CsErSe2

Abstract

We use neutron scattering and bulk property measurements to determine the single-ion crystal-field Hamiltonians of delafossites $\mathrm{KErS}{\mathrm{e}}_2$ and $\mathrm{CsErS}{\mathrm{e}}_2$. These two systems contains planar equilateral triangular Er lattices arranged in two stacking variants: rhombohedral (for K) or hexagonal (Cs). Our analysis shows that regardless the stacking order both compound exhibit an easy-plane ground state doublet with large $J_z=1/2$ terms and the potential for significant quantum effects, making them candidates for quantum spin liquid or other exotic ground states.

arXiv comment5 pages 4 figures in main text, with 4 pages and 5 figures in appendices

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• PyCrystalField: Software for Calculation, Analysis, and Fitting of Crystal Electric Field Hamiltonians
• Synthesis and Anisotropic Magnetism in Quantum Spin Liquid Candidates $A$YbSe${}_2$ ($A$ = K and Rb)
• Low-energy Spin Dynamics of Quantum Spin Liquid Candidate $NaYbS{e}_2$
• Magnetic field effects on the quantum spin liquid behaviors of NaYbS${}_2$
• Systematic extraction of crystal electric-field effects and quantum magnetic model parameters in triangular rare-earth magnets
• Magnetic properties of triangular lattice antiferromagnets Ba3RB9O18 (R = Yb, Er)
• Stripe antiferromagnetic ground state of ideal triangular lattice KErSe${}_2$
• Rare-Earth Chalcogenides: An Inspiring Playground For Exploring Frustrated Magnetism
• Fingerprinting Triangular-Lattice Antiferromagnet by Excitation Gaps
• Crystal-electric-field excitations in a quantum-spin-liquid candidate NaErS${}_2$
• Exchange renormalized crystal field excitation in a quantum Ising magnet KTmSe${}_2$
• Phase Diagram of YbZnGaO4 in Applied Magnetic Field
• Synthesis, disorder and Ising anisotropy in a new spin liquid candidate PrMgAl${}_{11}$O${}_{19}$
• Stripe order and spin dynamics in triangular-lattice antiferromagnet KErSe${}_2$: A single-crystal study with a theoretical description
• Quantitative investigation of the short-range magnetic correlations in candidate quantum spin liquid NaYbO${}_2$
• Quantifying uncertainties in crystal electric field Hamiltonian fits to neutron data
• Gapless spinon excitations emerging from a multipolar transverse field in the triangular-lattice Ising antiferromagnet NaTmSe2
• Finite Temperature Magnetism in the Triangular Lattice Antiferromagnet KErTe2
• Magnetic field-temperature phase diagram of spin-1/2 triangular lattice antiferromagnet KYbSe${}_2$
• Anomalous enhancement of magnetism by nonmagnetic doping in the honeycomb-lattice antiferromagnet ErOCl
• Emergent Dispersive Multipolar Excitations in NaErSe${}_2$