Artículo
Magnetic ground state and perturbations of the distorted kagome Ising metal TmAgGe
Larsen, C. B.; Mazzone, D. G.; Gauthier, Catherine; Rosales, Héctor Diego
; Gómez Albarracín, Flavia Alejandra
; Lass, J.; Boraley, X.; Bud'ko, S. L.; Canfield, P. C.; O. Zaharko
Fecha de publicación:
06/2023
Editorial:
American Physical Society
Revista:
Physical Review B: Condensed Matter and Materials Physics
ISSN:
1098-0121
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 = ( 12 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 neighbours 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 Tm3+ ions. Random phase approximation (RPA) calculations based on the determined CEF wave functions of the two lowest quasi-doublets 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.
Palabras clave:
KAGOME
,
INELASTIC NEUTRON SCATTERING
,
MONTE CARLO
,
TOPOLOGY
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Articulos(IFLYSIB)
Articulos de INST.FISICA DE LIQUIDOS Y SIST.BIOLOGICOS (I)
Articulos de INST.FISICA DE LIQUIDOS Y SIST.BIOLOGICOS (I)
Citación
Larsen, C. B.; Mazzone, D. G.; Gauthier, Catherine; Rosales, Héctor Diego; Gómez Albarracín, Flavia Alejandra; et al.; Magnetic ground state and perturbations of the distorted kagome Ising metal TmAgGe; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 107; 6-2023; 224419, 1-14
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