Anderson transitions in Ln1-xSrxCoO3 (Ln=Pr or Nd)

Rao, C. N. R. ; Parkash, Om (1977) Anderson transitions in Ln1-xSrxCoO3 (Ln=Pr or Nd) Philosophical Magazine, 35 (4). pp. 1111-1117. ISSN 1478-6435

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Electrical conductivity measurements show that Ln1−xSrxCoO3, (Ln = Pr or Nd) undergoes a non-metal-metal transition when x≈0 3. The d.c. conductivity of compositions with 0<x<0.l obeys the T−1/4 law up to 400 K and the a.c. conductivity data follow the ωδ law with δ in the range 0.6-0.8. Surprisingly, however, δ seems to increase with increasing temperature. Thermopower measurements show clear evidence for a change in the mechanism of conduction (around 350 K) from variable range hopping to transport at Ec. All these transport properties suggest that Co4+ ions in Ln1-xSrxCoO3 (0<x<0.1), considered as moving in a lattice of Co3+, form a degenerate gas and that the states at the Fermi energy are Anderson localized.

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