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- W1983087324 abstract "We report measurements of the susceptibility in the temperature range from 3.5 to 6.0 K of a series of ${text{Mn}}_{12}text{-ac}$ and ${text{Mn}}_{12}text{-ac-MeOH}$ samples in the shape of rectangular prisms of length ${l}_{c}$ and square cross section of side ${l}_{a}$. The susceptibility obeys a Curie-Weiss law, $ensuremath{chi}=C/(Tensuremath{-}ensuremath{theta})$, where $ensuremath{theta}$ varies systematically with sample aspect ratio. Using published demagnetization factors, we obtain $ensuremath{theta}$ for an infinitely long sample corresponding to intrinsic ordering temperatures ${T}_{c}ensuremath{approx}0.85text{ }text{K}$ and $ensuremath{approx}0.74text{ }text{K}$ for ${text{Mn}}_{12}text{-ac}$ and ${text{Mn}}_{12}text{-ac-MeOH}$, respectively. The difference in ${T}_{c}$ for two materials that have nearly identical unit cell volumes and lattice constant ratios suggests that, in addition to dipolar interactions, there is a nondipolar (exchange) contribution to the Weiss temperature that differs in the two materials because of the difference in ligand molecules." @default.
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- W1983087324 date "2010-11-03" @default.
- W1983087324 modified "2023-09-24" @default.
- W1983087324 title "Experimental determination of the Weiss temperature ofMn12-acandMn12-ac-MeOH" @default.
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- W1983087324 doi "https://doi.org/10.1103/physrevb.82.174405" @default.
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