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

Rao, CNR and Parkash, Om (1977) Anderson transitions in Ln1-xSrxCoO3 (Ln=Pr or Nd). In: Philosophical Magazine, 35 (4). pp. 1111-1117.

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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-1/4law up to 400 K and the a.c. conductivity data follow the \omega law with \delta in the range 0.6-0.8. Surprisingly, however, \delta 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.

Item Type: Journal Article
Publication: Philosophical Magazine
Publisher: Taylor and Francis Group
Additional Information: Copyright of this article belongs to Taylor and Francis Group.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 19 Oct 2009 09:11
Last Modified: 19 Oct 2009 09:11
URI: http://eprints.iisc.ac.in/id/eprint/24455

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