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Motivated by a recent finding of a spin-flop phenomenon in a system withoutanisotropy in spin space reported in the S=1/2 Heisenberg antiferromagnet onthe square-kagome lattice, we study the S=1/2 Heisenberg antiferromagnets ontwo other lattices composed of vertex-sharing triangles by the numericaldiagonalization method. One is a novel lattice including a shuriken shape withfour teeth; the other is the kagome lattice with$\sqrt{3}\times\sqrt{3}$-structure distortion, which includes a shuriken shapewith six teeth. We find in the magnetization processes of these systems that amagnetization jump accompanied by a spin-flop phenomenon occurs at thehigher-field-side edge of the magnetization plateau at one-third the height ofsaturation. This finding indicates that the spin-flop phenomenon found in theisotropic system on the square-kagome lattice is not an exceptional case.

Spin-Flop Phenomenon of Two-Dimensional Frustrated Antiferromagnets without Anisotropy in Spin Space