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In the pyrochlor system Ln 2-x Cu x Ru 2 O 7-z  a partial substitution of Pr bv Cu is observed for x ≾ 0.375. With increasing x a gradual semiconductor-metal transition occurs. The change of sign of TCR from negative to positive is observed for ρ ∾ 6 × 10 -3  Ω cm (x = 0.2). The presence of variable range hopping in the insulating regime strongly suggests that the metal-semiconductor transition is of Anderson type. For the pyrochlores of type Ln 1.625 Cu 0.375 Ru 7-z  with the smaller rare earth ions Sm, Eu, Gd, Dy the metallic conductivity is absent and localization of Anderson type occurs.

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Der Halbleiter-Metall-Übergang in Pyrochloren des Systems Ln 2-x Cu x Ru 2 O 7-z  (Ln = Pr, Sm, Eu, Gd, Dy) / The Semiconductor-Metal Transition in Pyrochlors of the System Ln 2-x Cu x Ru 2 O 7-z  (Ln = Pr, Sm, Eu, Gd, Dy)