Abstract
Measurements of the temperature dependence of the thermal conductivity $\ensuremath{\kappa}(T)$ of the antiferromagnetic perovskites ${\mathrm{SmNiO}}_{3},$ ${\mathrm{CaMnO}}_{3},$ ${\mathrm{LaMnO}}_{3},$ and ${\mathrm{YCrO}}_{3}$ are compared to that of the nonmagnetic perovskite ${\mathrm{LaGaO}}_{3}.$ Whereas ${\mathrm{LaGaO}}_{3}$ exhibits a classic phonon thermal conductivity, the others all show a remarkable suppression of $\ensuremath{\kappa}(T)$ in the paramagnetic phase that increases with the degree of covalence in the $M--\mathrm{O}$ bond. This suppression is attributed to exchange-strictive fluctuations that are enhanced by semicovalent-exchange interactions.
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