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Spin-flop phenomenon of two-dimensional frustrated antiferromagnets without anisotropy in spin space

Nakano, Hiroki*; Sakai, Toru; Hasegawa, Yasumasa*

Motivated by a recent finding of a spin-flop phenomenon in a system without anisotropy in spin space reported in the $$S$$ = 1/2 Heisenberg antiferromagnet on the square-kagome lattice, we study the $$S$$ = 1/2 Heisenberg antiferromagnets on two other lattice composed of vertex-sharing triangles using the numerical diagonalization method. One is a novel lattice including a ${it shuriken}$ shape with four teeth; the other is a distorted kagome lattice, which includes a ${it shuriken}$ shape with six teeth. We find in the magnetization processes of these systems that a magnetization jump accompanied by a spin-flop phenomenon occurs at the higher-field-side edge of the magnetization plateau at one-third the height of saturation.

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