Frustrated magnetism in triangular layered MGa<sub>2</sub>S<sub>4</sub> (M=Ni,Fe) compounds
ORAL
Abstract
The perfect triangular lattice is the simplest 2D magnetic lattice to study magnetic frustration which can lead to exotic quantum phenomena. In this work we focus on MGa2S4 compounds with a magnetic ion M = Ni, Fe. Both systems crystallize in a perfect layered triangular Fe/Ni-lattice separated by non-magnetic Ga and S atoms. Recent neutron and magnetic susceptibility experiments1 suggest strong exchange couplings for both systems.
Using ab-initio methods (total-energy mapping analysis and “projED”2) we extract an effective magnetic Hamiltonian including magnetic interactions up to the third next nearest neighbors and single ion anisotropy. We discuss the comparison between neutron scattering intensity of the model for the pristine crystal and experimental results where mixing of the M and Ga cations was suggested.
[1] K. Guratinder et al., Phys. Rev. B 104, 064412 (2021)
[2] K. Riedl et al., Phys. Status Solidi B 256, 1800684 (2019)
Using ab-initio methods (total-energy mapping analysis and “projED”2) we extract an effective magnetic Hamiltonian including magnetic interactions up to the third next nearest neighbors and single ion anisotropy. We discuss the comparison between neutron scattering intensity of the model for the pristine crystal and experimental results where mixing of the M and Ga cations was suggested.
[1] K. Guratinder et al., Phys. Rev. B 104, 064412 (2021)
[2] K. Riedl et al., Phys. Status Solidi B 256, 1800684 (2019)
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Presenters
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Aleksandar Razpopov
Goethe University Frankfurt
Authors
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Aleksandar Razpopov
Goethe University Frankfurt
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Kira Riedl
Goethe University Frankfurt
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Oksana Zaharko
Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen, Switzerland, Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232, Villigen, PSI, Switzerland
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Roser Valenti
Goethe University Frankfurt