2 research outputs found
Magnetism in AV3Sb5 (Cs, Rb, K): Origin and Consequences for the Strongly Correlated Phases
The V-based kagome systems AV3Sb5 (A = Cs, Rb and K) are unique by virtue of
the intricate interplay of non-trivial electronic structure, topology and
intriguing fermiology, rendering them to be a playground of many mutually
dependent exotic phases like charge-order and superconductivity. Despite
numerous recent studies, the interconnection of magnetism and other complex
collective phenomena in these systems has yet not arrived at any conclusion.
Using first-principles tools, we demonstrate that their electronic structures,
complex fermiologies and phonon dispersions are strongly influenced by the
interplay of dynamic electron correlations, non-trivial spin-polarization and
spin-orbit coupling. An investigation of the first-principles-derived
inter-site magnetic exchanges with the complementary analysis of q-dependence
of the electronic response functions and the electron-phonon coupling indicate
that the system conforms as a frustrated spin-cluster, where the occurrence of
the charge-order phase is intimately related to the mechanism of
electron-phonon coupling, rather than the Fermi-surface nesting.Comment: Accepted in Physical Review Letter
Magnetism in AV3Sb5 (A = Cs, Rb, K): Complex Landscape of the Dynamical Magnetic Textures
We have investigated the dynamical magnetic properties of the V-based kagome
stibnite compounds by combining the ab-initio calculated magnetic parameters of
a spin Hamiltonian like inter-site exchange parameters, magnetocrystalline
anisotropy and site projected magnetic moments, with full-fledged simulations
of atomistic spin-dynamics. Our calculations reveal that in addition to a
ferromagnetic order along the [001] direction, the system hosts a complex
landscape of magnetic configurations comprised of commensurate and
incommensurate spin-spirals along the [010] direction. The presence of such
chiral magnetic textures may be the key to solve the mystery about the origin
of the experimentally observed inherent breaking of the C6 rotational symmetry-
and the time-reversal symmetry.Comment: Accepted In Physical Review