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- W1609508568 abstract "A Fermi surface with a square cross section and slightly rounded corners, which results from perpendicular sets of weakly coupled one-dimensional chains, is found both experimentally and theoretically to lead to a strong enhancement of the low-field magnetoresistance, and a logarithmic dependence on the magnetic field, $frac{ensuremath{Delta}ensuremath{rho}(H)}{ensuremath{rho}(0)}ensuremath{propto}frac{{H}^{2}mathrm{ln}{H}_{0}}{H} mathrm{for} H<{H}_{0}$, where ${H}_{0}$ is a characteristic effective field. The logarithmic dependence is observed for ${mathrm{Hg}}_{3ensuremath{-}ensuremath{delta}}mathrm{As}{mathrm{F}}_{6}$ in a series of new high-sensitivity experimental results for $0.5<H<40$ Oe at a temperature of 4.2 K. Analysis of the data leads to a value for the weak interchain coupling ($frac{ensuremath{Delta}E}{{E}_{F}}ensuremath{simeq}6ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}3}$). Hall-effect data are presented for the temperature range $4.2<T<100$ K, and fields up to 4.5 kOe. At low temperatures, the measured Hall coefficient is in agreement with the anisotropic three-dimensional Fermi surface determined earlier by de Haas-van Alphen measurements. The smaller Hall coefficient above 10 K suggests the possibility of a crossover to localization onto families of parallel one-dimensional chains." @default.
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- W1609508568 date "1981-06-01" @default.
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- W1609508568 title "Logarithmic dependence of the low-field magnetoresistance inHg3−δAsF6" @default.
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- W1609508568 doi "https://doi.org/10.1103/physrevb.23.5993" @default.
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