Thermal conductivity of electron-doped CaMnO3 perovskites: Local lattice distortions and optical phonon thermal excitation
作者： Yang Wang , Yu Sui , Xianjie Wang , Wenhui Su , Xiaoyang Liu
DOI: 10.1016/J.ACTAMAT.2010.07.052
关键词: Materials science 、 Néel temperature 、 Atmospheric temperature range 、 Thermal conductivity 、 Condensed matter physics 、 Thermal Hall effect 、 Paramagnetism 、 Spin wave 、 Phonon 、 Thermal conduction
摘要: The thermal transport properties of a series electron-doped CaMnO(3) perovskites have been investigated. Throughout the temperature range 5-300 K, phonon conductivity is dominant, and both electron spin wave contributions are negligible. short mean free paths in this system result relatively low conductivities. strong scatterings stem from A-site mismatch bond-length fluctuations induced by local distortions MnO(6) octahedra. magnetically ordered state enhanced as decrease spin-phonon scattering. results also indicate that above magnetic ordering temperature, observable excitation optical phonons occurs. contribution to becomes non-negligible proposed play an important role glass-like behavior (i.e. positive dependence conductivity) paramagnetic state. These features can be understood terms expression includes acoustic terms. (C) 2010 Acta Materialia Inc. Published Elsevier Ltd. All rights reserved.
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