Thermal Properties of Some RE1-xEAxMnO3 Compounds

J. Liebe, E. Kraus, L. Haupt, K. Bärner, P. Mandal, I. V. Medvedeva, E. Gmelin, R. V. Helmolt
1997 Journal de Physique IV : Proceedings  
The Seebeck-effect and the thermal diffusivity n of epitaxial layers of Lao.67Cao.33Mn03-6 and bulk samples of NQ.e.rSro.ssMnO3-6 were investigated in the temperature range 35K < T < 300K using the time resolved thermoelectric power (flash) method. In the temperature regime of the high magnetoresistance (GMR) which is close to the maximum resistivity p", of the LsrCa compound, we fhd a sign change of S(T) and a step in heat conductivity which we attribute to a temperatureinduced metal-insulator
more » ... transition at about 80K. For NQ.67Sro.s3Mn03-~ such a transition is also observed, but around 160K; here S(T) is always positive except for a gradual sign change at 370
doi:10.1051/jp4:19971262 fatcat:dip62wjohfdl7dzkgieohnuj4u