TY - JOUR
T1 - Determination of the critical conductivity exponent for the metal-insulator transition at nonzero temperatures
T2 - Universality of the transition
AU - Shlimak, I.
AU - Kaveh, M.
AU - Ussyshkin, R.
AU - Ginodman, V.
AU - Resnick, L.
PY - 1996
Y1 - 1996
N2 - A new approach has been developed for the determination of the critical conductivity exponent μ and the critical concentration Nc of the metal-insulator transition without extrapolation of the temperature dependence of the conductivity σ(T) to T = 0. We propose to replace σ(0) by Δσ(T*)= σN (T*) - σNc (T*) at low T*, where σ(T) = a + b Tp, p = 1/2 or 1/3 is observed. Two series of samples of Ge:As and Ge:Sb were investigated. It is shown that μ = 1 for both series. The normalized values of Δ σ (T*) / σ merge for Ge:As, Ge:Sb, Si:P, and Si:Sb into a universal line.
AB - A new approach has been developed for the determination of the critical conductivity exponent μ and the critical concentration Nc of the metal-insulator transition without extrapolation of the temperature dependence of the conductivity σ(T) to T = 0. We propose to replace σ(0) by Δσ(T*)= σN (T*) - σNc (T*) at low T*, where σ(T) = a + b Tp, p = 1/2 or 1/3 is observed. Two series of samples of Ge:As and Ge:Sb were investigated. It is shown that μ = 1 for both series. The normalized values of Δ σ (T*) / σ merge for Ge:As, Ge:Sb, Si:P, and Si:Sb into a universal line.
UR - http://www.scopus.com/inward/record.url?scp=0001181435&partnerID=8YFLogxK
U2 - 10.1103/physrevlett.77.1103
DO - 10.1103/physrevlett.77.1103
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AN - SCOPUS:0001181435
SN - 0031-9007
VL - 77
SP - 1103
EP - 1106
JO - Physical Review Letters
JF - Physical Review Letters
IS - 6
ER -