Abstract
Temperature dependences (77–300 K) of the thermal capacity, diffusion, and conductivity are investigated for the Nd 0.5 Sr 0.5 MnO 3 and Nd 0.55 Sr 0.45 MnO 3 polycrystalline samples. The examined characteristics show anomalous behavior in the magnetic phase transition and transition to the charge-ordered state. It is demonstrated that the main reason for a sharp decrease in the thermal conductivity during Nd 0.5 Sr 0.5 MnO 3 transition into the antiferromagnetic charge-ordered state is a change in the phonon spectrum caused by the lattice compression. A temperature dependence of the free phonon path is calculated for the examined temperature interval based on the thermal diffusion obtained and the literature data on the sound propagation velocity.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 72–75, April, 2007.
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Gamzatov, A.G., Aliev, A.M., Abdulvagidov, S.B. et al. Thermal capacity, diffusion, and conductivity of Nd1−x SrxMno3 (x = 0.45 and 0.5) manganites. Russ Phys J 50, 383–386 (2007). https://doi.org/10.1007/s11182-007-0053-0
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DOI: https://doi.org/10.1007/s11182-007-0053-0