Abstract
The stacked triangular lattice antiferromagnet GdPd2Al3 has a helical magnetic structure of extremely long incommensurate modulation below TN2 (= 13.3 K). In order to observe the dependence of the magnetic structure on magnetic field applied in the spin plane, we performed resonant magnetic x-ray diffraction experiments in magnetic fields up to 0.15 T at 4 K and observed a first-order incommensurate-to-commensurate transition around 0.04 T. This result indicates that the free energy has a double-well structure around the K-point.
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