1210.0410 (J. A. Turcaud et al.)

Microstuctural control and tuning of thermal conductivity in
La0.67Ca0.33MnO3+/-δ    [PDF]

J. A. Turcaud, K. Morrison, A. Berenov, N. McN. Alford, K. G. Sandeman, L. F. Cohen

Manganites are one of only a small number of material families currently being trialled as room temperature magnetic refrigerants. Here we examine the dependence of the thermal conductivity, K, of La0.67Ca0.33MnO3+/-{\delta} as a function of density, grain size and silver impregnation around room temperature. We use a simple effective medium model to extract relevant trends in the data and demonstrate a threefold increase in thermal conductivity by silver impregnation.

View original: http://arxiv.org/abs/1210.0410