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- W3184572002 abstract "We consider a class of anisotropic spin-$frac{1}{2}$ models with competing ferro- and antiferromagnetic interactions on two-dimensional Tasaki and kagome lattices consisting of corner sharing triangles. For certain values of the interactions the ground state is macroscopically degenerated in zero magnetic field. In this case the ground state manifold consists of isolated magnons as well as the bound magnon complexes. The ground state degeneracy is estimated using a special form of exact wave function which admits arrow configuration representation on two-dimensional lattice. The comparison of this estimate with the result for some special exactly solved models shows that the used approach determines the number of the ground states with exponential accuracy. It is shown that the main contribution to the ground state degeneracy and the residual entropy is given by the bound magnon complexes." @default.
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- W3184572002 date "2021-08-13" @default.
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- W3184572002 title "Two-dimensional spin models with macroscopic degeneracy" @default.
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- W3184572002 doi "https://doi.org/10.1088/1361-648x/ac18f4" @default.
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