ISSN:
1572-9567
Keywords:
exciton formation energy
;
GdCoO3
;
NdCoO3
;
thermal
;
conductivity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Thermal conductivity of NdCoO3 and GdCoO3 has been studied from 300 to 1200 K. The conductivity is mainly excitonic, arising from the interactions of the t2g−eg states of cobalt ions in the oxides and shows characteristic maxima at 1030 and 975 K, respectively, corresponding with their semiconductor-metal transition temperatures. Contributions to thermal conductivity by phononic, electronic, ambipolar, and excitonic modes of conduction are calculated from measured thermal and electrical conductivity data in this temperature range. The energy of exciton formation in both the compounds is found to be 0.11 eV, same as in the case of LaCoO3.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00506132
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