Spin waves in the fcc lattice antiferromagnet: competing interactions, frustration, and instabilities in the Hubbard model
Avinash Singh,1,2,a) Shubhajyoti Mohapatra,2 Timothy Ziman,1 and Tapan Chatterji1
1 Institute Laue Langevin (ILL), 71 avenue des Martyrs, CS 20156, 38042 GRENOBLE CEDEX 9, France
2 Department of Physics, Indian Institute of Technology, Kanpur 208016, India
(Received 7 December 2016; accepted 3 February 2017; published online 21 February 2017)
Abstract
Spin waves in the type-III ordered antiferromagnetic state of the frustrated t-t 0 Hubbard model on the face-centred-cubic (fcc) lattice are calculated to investigate finite-U-induced competing interaction and frustration effects on magnetic excitations and instabilities. Particularly strong competing interactions generated due to the interplay of fcc lattice geometry and magnetic order result in significant spin wave softening. The calculated spin wave dispersion is found to be in qualitative agreement with the measured spin wave dispersion in the pyrite mineral MnS2 obtained from inelastic neutron scattering experiments. Instabilities to other magnetic orders (type I, type II, spiral, non-collinear), as signalled by spin wave energies turning negative, are also discussed.
https://www.researchgate.net/publication/306885918_Spin_waves_in_the_fcc_lattice_antiferromagnet_competing_interactions_frustration_and_instabilities_in_the_Hubbard_model
1 Institute Laue Langevin (ILL), 71 avenue des Martyrs, CS 20156, 38042 GRENOBLE CEDEX 9, France
2 Department of Physics, Indian Institute of Technology, Kanpur 208016, India
(Received 7 December 2016; accepted 3 February 2017; published online 21 February 2017)
Abstract
Spin waves in the type-III ordered antiferromagnetic state of the frustrated t-t 0 Hubbard model on the face-centred-cubic (fcc) lattice are calculated to investigate finite-U-induced competing interaction and frustration effects on magnetic excitations and instabilities. Particularly strong competing interactions generated due to the interplay of fcc lattice geometry and magnetic order result in significant spin wave softening. The calculated spin wave dispersion is found to be in qualitative agreement with the measured spin wave dispersion in the pyrite mineral MnS2 obtained from inelastic neutron scattering experiments. Instabilities to other magnetic orders (type I, type II, spiral, non-collinear), as signalled by spin wave energies turning negative, are also discussed.
https://www.researchgate.net/publication/306885918_Spin_waves_in_the_fcc_lattice_antiferromagnet_competing_interactions_frustration_and_instabilities_in_the_Hubbard_model
Hello, my name is Dr Abderrahmane Reggad. I'm a 51 year old and I am a researcher in materials' sciences.
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