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- W2088926512 abstract "We present measurements of tunnelling conductances (at T=4.2 K) of point contact and planar junctions formed on sodium tungsten bronze single crystals as the carrier concentration is changed through the metal-insulator (MI) transition. We find that the junction conductance is varies as mod V mod 1/2 on the metallic side, and that as the MI transition is approached, the voltage dependence becomes deeper and changes to a linear dependence ( varies as mod V mod ) in the critical region. We interpret this observed behaviour as being due to evolution of short-range screened Coulomb interactions (giving rise to a square-root cusp in the density of states) in the disordered metallic phase into an Efros-Shklovskii-type Coulomb gap in the insulating phase. The possibility of breakdown of normal Fermi-liquid-like behaviour in the critical region is discussed." @default.
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- W2088926512 date "1993-11-01" @default.
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- W2088926512 title "Tunnelling studies on sodium tungsten bronzes near the metal-insulator transition" @default.
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- W2088926512 doi "https://doi.org/10.1088/0953-8984/5/44/002" @default.
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