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- W1994798382 abstract "The specific heat of ${mathrm{Na}}_{x}{mathrm{V}}_{2}{mathrm{O}}_{5}$, $x=0.2, 0.25, 0.3, 0.36, mathrm{and} 0.41$, and of pure ${mathrm{V}}_{2}$${mathrm{O}}_{5}$ single crystals, was measured between 0.5 and 50 K in zero magnetic field as well as in fields of different intensities up to 2.8 T. The specific heat of pure ${mathrm{V}}_{2}$${mathrm{O}}_{5}$ shows a well-defined maximum in $frac{C}{{T}^{3}}$; this indicates the presence of low-lying modes which can be described by Einstein oscillators. The lowest Einstein frequency ${ensuremath{nu}}_{E}$ obtained from the specific-heat data is 76 ${mathrm{cm}}^{ensuremath{-}1}$ while the Debye temperature ${ensuremath{Theta}}_{D}=164$ K. The addition of sodium to ${mathrm{V}}_{2}$${mathrm{O}}_{5}$ enhances the specific heat below 7 K considerably. The excess specific heat is linear in temperature and is magnetic field dependent and can be described by a simple model of many three-level systems with spin $S=1$. However, this model is at the moment not understood theoretically. This is the same difficulty encountered in spin-glasses which also contain an excess specific heat rather linear in temperature over a considerable temperature range." @default.
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- W1994798382 date "1983-01-15" @default.
- W1994798382 modified "2023-09-24" @default.
- W1994798382 title "Specific heat of sodium-vanadium bronzesNaxV2O5between 0.5 and 50 K" @default.
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- W1994798382 doi "https://doi.org/10.1103/physrevb.27.978" @default.
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