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Anderson transitions in Ln1-x Sr x CoO3 (Ln═Pr or Nd)

Om Parkash, * and Rao, CNR (1977) Anderson transitions in Ln1-x Sr x CoO3 (Ln═Pr or Nd). In: Philosophical Magazine, 35 (4). pp. 1111-1117.

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Official URL: http://www.tandfonline.com/doi/abs/10.1080/1478643...

Abstract

Electrical conductivity measurements show that Ln1-x Sr x CoO3, (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 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 E c. All these transport properties suggest that Co4+ ions in Ln1-x Sr x CoO3 (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
Additional Information: Copyright of this article belongs to Taylor and Francis Group.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Ms V Mangala
Date Deposited: 23 Feb 2012 06:26
Last Modified: 23 Feb 2012 06:26
URI: http://eprints.iisc.ac.in/id/eprint/43183

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