Abstract
The temperature dependence of the thermal conductivity κ(T) andelectrical resistivity ρ(T) has been measured for perovskiteNd0.7Sr0.3Mn1−xCrxO3 (0.01⩽x⩽0.15)in the temperature range of 10–300 K. The double-bump featurein ρ(T) is observed for x = 0.08 and 0.10samples. Below the insulating-metallic transition temperature TIM,κ(T) shows a sharp increase and such an increase is depressedgradually by the increasing Cr content. While κ(T) displays ananomalous decrease around the temperature where the second bump of ρ(T) emerges. We suggest that the enhancement of κ(T) belowTIM is related to both phonons and magnons, the ferromagneticinteraction of Mn3+-O-Cr3+ should be super-exchangeinteraction rather than double-exchange interaction, and the Crdoping just weakens the DE interaction in this system.
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