Abstract
The frustrated magnetic structure of hexagonal RMnO 3 (R=Sc, Y, Ho, Er, Tm, Yb, Lu) is analyzed by optical second-harmonic (SH) spectroscopy. It is found that in all compounds the Mn 3+ spins form antiferromagnetic triangles in the xy easy plane with parallel coupling between adjacent layers at z=0 and c/2 in the unit cell ( α-type ordering). Some earlier conclusions on the magnetic structure of RMnO 3 should be revised.
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