Quantifying uncertainties in crystal electric field Hamiltonian fits to  neutron data

Scheie, Allen

doi:10.21468/scipostphyscore.5.1.018

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…It should be noted that, while we believe our fit improves upon the CEF model of Ref. [9], it is still an approximate model due to the few peaks in the TmAgGe neutron spectra and the known difficulty of fitting CEF parameters with limited data [27].…”

Section: Crystal-field Level Schemementioning

confidence: 69%

Magnetic ground state and perturbations of the distorted kagome Ising metal TmAgGe

2023

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We present the magnetic orders and excitations of the distorted kagome intermetallic magnet TmAgGe. Using neutron single crystal diffraction we identify the propagation vectors k = ( 1 2 0 0) and k = (0 0 0) and determine the magnetic structures of the zero-field and magnetic field-induced phases for H along the a and [−110] crystal directions. We determine the experimental magnetic field-temperature (H , T )-phase diagram and reproduce it by Monte Carlo simulations of an effective spin exchange Hamiltonian for one distorted kagome layer. Our model includes a strong axial single-ion anisotropy and significantly smaller exchange couplings, which span up to the third-nearest neighbors within the layer. Single crystal inelastic neutron scattering (INS) measurements reveal an almost flat, only weakly dispersive mode around 7 meV that we use alongside bulk magnetization data to deduce the crystal-electric field (CEF) scheme for the Tm 3+ ions. Random phase approximation (RPA) calculations based on the determined CEF wave functions of the two lowest quasidoublets enable an estimation of the interlayer coupling that is compatible with the experimental INS spectra. No evidence for low-energy spin waves associated to the magnetic order was found, which is consistent with the strongly Ising nature of the ground state.

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Section: Crystal-field Level Schemementioning

confidence: 69%