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- W4206184499 abstract "We demonstrate that the single crystal of ${mathrm{YCu}}_{3}$[OH(D)${mathrm{]}}_{6.5}{mathrm{Br}}_{2.5}$ (YCOB) is a kagome Heisenberg antiferromagnet without evident orphan spins ($ensuremath{ll}0.8$%). The site mixing between polar ${mathrm{OH}}^{ensuremath{-}}$ and nonpolar ${mathrm{Br}}^{ensuremath{-}}$ causes local distortions of Cu--O--Cu exchange paths and gives rise to 70(2)% of randomly distributed hexagons of alternate bonds ($ensuremath{sim}{J}_{1}ensuremath{-}mathrm{ensuremath{Delta}}J$ and ${J}_{1}+mathrm{ensuremath{Delta}}J$) and the rest of the almost-uniform hexagons ($ensuremath{sim}{J}_{1}$) on the kagome lattice. Simulations of the random exchange model with $mathrm{ensuremath{Delta}}J/{J}_{1}$ = 0.7(1) show good agreement with experimental observations, including the weak upturn seen in susceptibility and the slight polarization in magnetization. Despite the average antiferromagnetic coupling of ${J}_{1}ensuremath{sim}60$ K, no conventional freezing is observed down to $Tensuremath{sim}0.001{J}_{1}$, and the raw specific heat exhibits a nearly quadratic temperature dependence below 1 K $ensuremath{sim}0.02{J}_{1}$, phenomenologically consistent with a gapless (spin gap $ensuremath{le}0.025{J}_{1}$) Dirac quantum spin liquid (QSL). Our result sheds light on the theoretical understanding of the randomness-relevant gapless QSL behavior in YCOB, as well as in other relevant materials." @default.
- W4206184499 created "2022-01-26" @default.
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- W4206184499 date "2022-01-18" @default.
- W4206184499 modified "2023-10-13" @default.
- W4206184499 title "Gapless spin liquid behavior in a kagome Heisenberg antiferromagnet with randomly distributed hexagons of alternate bonds" @default.
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- W4206184499 doi "https://doi.org/10.1103/physrevb.105.024418" @default.
- W4206184499 hasPublicationYear "2022" @default.
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