Single helicity of the triple-q triangular skyrmion lattice state in cubic chiral helimagnet EuPtSi
Physical Review B(2024)
摘要
We investigated the magnetic helicity of the triple-q magnetic structure of
the triangular skyrmion lattice in the “A-phase" of EuPtSi for a magnetic
field along the [111] axis by resonant x-ray diffraction using a circularly
polarized beam. We show that all three Fourier components of the triple-q
structure are perpendicular to the respective q vectors and have the same
helicity. They are connected by the rotation operations about the [111] axis.
The helicity is the same as that of the single-q helimagnetic phase at low
fields, suggesting that the antisymmetric exchange interaction inherent in the
chiral structure supports the formation of the triangular skyrmion lattice. We
also observe that the helical plane in the helimagnetic phase is tilted to the
magnetic field to form a conical structure before the first-order transition to
the skyrmion lattice phase.
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