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- W2085465893 abstract "We have determined the localization length xi and the impurity dielectric susceptibility chi_{rm imp} as a function of Ga acceptor concentrations (N) in nominally uncompensated ^{70}Ge:Ga just below the critical concentration (N_c) for the metal-insulator transition. Both xi and chi_{rm imp} diverge at N_c according to the functions xipropto(1-N/N_c)^{-nu} and chi_{rm imp}propto(N_c/N-1)^{-zeta}, respectively, with nu=1.2pm0.3 and zeta=2.3pm0.6 for 0.99N_c< N< N_c. Outside of this region (N<0.99N_c), the values of the exponents drop to nu=0.33pm0.03 and zeta=0.62pm0.05. The effect of the small amount of compensating dopants that are present in our nominally uncompensated samples, may be responsible for the change of the critical exponents at Napprox0.99N_c." @default.
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- W2085465893 date "2000-07-15" @default.
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- W2085465893 title "Localization length and impurity dielectric susceptibility in the critical regime of the metal-insulator transition in homogeneously doped<b><i>p</i></b>-type<b>Ge</b>" @default.
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- W2085465893 doi "https://doi.org/10.1103/physrevb.62.r2255" @default.
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