Spectroscopic measurements on CeSiI determine crystal-field levels and magnons, which are accounted for by dominant ferromagnetic nearest-neighbor Heisenberg exchange on a 2D lattice that stabilizes a co-rotating spin cycloid.
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Magnetic order, magnons, and crystal fields in van der Waals CeSiI
Spectroscopic measurements on CeSiI determine crystal-field levels and magnons, which are accounted for by dominant ferromagnetic nearest-neighbor Heisenberg exchange on a 2D lattice that stabilizes a co-rotating spin cycloid.