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- W2022082974 abstract "NMR measurements of the cubic alkali tungsten bronzes ${mathrm{Na}}_{x}mathrm{W}{mathrm{O}}_{3}$ ($0.22ensuremath{lesssim}xensuremath{lesssim}0.84$) and ${mathrm{Li}}_{x}mathrm{W}{mathrm{O}}_{3}$ ($0.27ensuremath{lesssim}xensuremath{lesssim}0.49$) are presented. Knight shifts, relaxation times, and line shapes of $^{183}mathrm{W}$ were studied over the temperature range 1.35-4.2 K. ${T}_{1}$ and $K$ of $^{7}mathrm{Li}$ at 77 and 298 K were also measured. These results coupled with previous $^{23}mathrm{Na}$ measurements are correlated to possible conduction-band models. The results for $x>0.40$ are consistent with a $mathrm{W}5d({t}_{2g})$ conduction band analogous to the Re $5d({t}_{2g})$ band in Re ${mathrm{O}}_{3}$ band-structure calculations. For $x<0.40$ the data suggest admixture of Na and W $6s$ states in the ${mathrm{Na}}_{x}mathrm{W}{mathrm{O}}_{3}$ conduction band. Regarding the metal-semiconductor transition occurring in the bronzes, the NMR results seem incompatible with simple nearest-neighbor linkage and correlated site percolation models of conduction for the bronzes. The results give no evidence of a Mott-type transition occurring as no correlation effects are observable." @default.
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- W2022082974 date "1978-01-15" @default.
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- W2022082974 title "Nuclear-magnetic-resonance study of the cubic alkali tungsten bronzes" @default.
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- W2022082974 doi "https://doi.org/10.1103/physrevb.17.566" @default.
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