Anderson transitions in Ln1-xSrxCoO3(Ln═Pr or Nd)
- 1 April 1977
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 35 (4) , 1111-1117
- https://doi.org/10.1080/14786437708232650
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<xT−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<x3+, form a degenerate gas and that the states at the Fermi energy are Anderson localized.Keywords
This publication has 15 references indexed in Scilit:
- AC conductivity in amorphous germaniumJournal of Non-Crystalline Solids, 1975
- States in the gap and recombination in amorphous semiconductorsPhilosophical Magazine, 1975
- Evolution des propriétés cristallographiques, electriques et magnétiques au sein du système La1−xSrxVO3Journal of Solid State Chemistry, 1975
- The Anderson transitionProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1975
- Evaluation of Mott's Parameters for Hopping Conduction in Amorphous Ge, Si, and Se-SiPhysical Review Letters, 1973
- The nature of the electronic states of a disordered system. I. Localized statesJournal of Physics C: Solid State Physics, 1972
- Observation of Anderson Localization in an Electron GasPhysical Review B, 1969
- Polarons in crystalline and non-crystalline materialsAdvances in Physics, 1969
- Conduction in glasses containing transition metal ionsJournal of Non-Crystalline Solids, 1968
- Absence of Diffusion in Certain Random LatticesPhysical Review B, 1958