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- W3100208498 abstract "It is noted that the pair correlation matrix $hat{chi}$ of the nearest neighbor Ising model on periodic three-dimensional ($d=3$) kagome-like lattices of corner-sharing triangles can be calculated partially exactly. Specifically, a macroscopic number $1/3 , N+1$ out of $N$ eigenvalues of $hat{chi}$ are degenerate at all temperatures $T$, and correspond to an eigenspace $mathbb{L}_{-}$ of $hat{chi}$, independent of $T$. Degeneracy of the eigenvalues, and $mathbb{L}_{-}$ are an exact result for a complex $d=3$ statistical physical model. It is further noted that the eigenvalue degeneracy describing the same $mathbb{L}_{-}$ is exact at all $T$ in an infinite spin dimensionality $m$ limit of the isotropic $m$-vector approximation to the Ising models. A peculiar match of the opposite $m=1$ and $mrightarrow infty$ limits can be interpreted that the $mrightarrowinfty$ considerations are exact for $m=1$. It is not clear whether the match is coincidental. It is then speculated that the exact eigenvalues degeneracy in $mathbb{L}_{-}$ in the opposite limits of $m$ can imply their quasi-degeneracy for intermediate $1 leqslant m < infty$. For an anti-ferromagnetic nearest neighbor coupling, that renders kagome-like models highly geometrically frustrated, these are spin states largely from $mathbb{L}_{-}$ that for $mgeqslant 2$ contribute to $hat{chi}$ at low $T$. The $mrightarrowinfty$ formulae can be thus quantitatively correct in description of $hat{chi}$ and clarifying the role of perturbations in kagome-like systems deep in the collective paramagnetic regime. An exception may be an interval of $T$, where the order-by-disorder mechanisms select sub-manifolds of $mathbb{L}_{-}$." @default.
- W3100208498 created "2020-11-23" @default.
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- W3100208498 date "2017-03-01" @default.
- W3100208498 modified "2023-10-16" @default.
- W3100208498 title "The large-m limit, and spin liquid correlations in kagome-like spin models" @default.
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- W3100208498 doi "https://doi.org/10.5488/cmp.20.13701" @default.
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