An x-dependent Lifshitz transition creates a Fermi-surface pocket in Eu(Ga1-xAlx)4 whose multiple nesting vectors match the symmetries and periodicities of its skyrmion lattices and zero-field helical order, indicating a common nesting-induced RKKY origin.
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Origin of multiple skyrmion phases in EuAl4
An x-dependent Lifshitz transition creates a Fermi-surface pocket in Eu(Ga1-xAlx)4 whose multiple nesting vectors match the symmetries and periodicities of its skyrmion lattices and zero-field helical order, indicating a common nesting-induced RKKY origin.