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Thermal conductivity of electron-doped CaMnO3 perovskites: Local lattice distortions and optical phonon thermal excitation
Wang, Yang1,2; Sui, Yu1,4; Wang, Xianjie1; Su, Wenhui1; Liu, Xiaoyang3; Fan, Hong Jin2
Corresponding AuthorSui, Yu(suiyu@hit.edu.cn)
2010-11-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume58Issue:19Pages:6306-6316
AbstractThe thermal transport properties of a series of electron-doped CaMnO3 perovskites have been investigated. Throughout the temperature range 5-300 K, phonon thermal conductivity is dominant, and both electron and spin wave contributions are negligible. The short phonon mean free paths in this system result in the relatively low thermal conductivities. The strong phonon scatterings stem from the A-site mismatch and bond-length fluctuations induced by local distortions of MnO6 octahedra. The thermal conductivity in the magnetically ordered state is enhanced as a result of the decrease in spin-phonon scattering. The results also indicate that above the magnetic ordering temperature, observable thermal excitation of optical phonons occurs. The contribution of optical phonons to thermal conductivity becomes non-negligible and is proposed to play an important role in the glass-like thermal transport behavior (i.e. positive temperature dependence of the thermal conductivity) in the paramagnetic state. These features can be understood in terms of an expression of thermal conductivity that includes both acoustic and optical phonon terms. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordManganite perovskite Thermal conductivity Spin-phonon scattering MnO6 distortion Optical phonon
Funding OrganizationScientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry) ; Natural Scientific Research Innovation Foundation in Harbin Institute of Technology (HIT NSRIF) ; National Natural Science Foundation of China ; Nanyang Technological University
DOI10.1016/j.actamat.2010.07.052
Indexed BySCI
Language英语
Funding ProjectScientific Research Foundation for the Returned Overseas Chinese Scholars (State Education Ministry) ; Natural Scientific Research Innovation Foundation in Harbin Institute of Technology (HIT NSRIF)[2009056] ; National Natural Science Foundation of China[10804024] ; Nanyang Technological University
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000283807900010
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/101028
Collection中国科学院金属研究所
Corresponding AuthorSui, Yu
Affiliation1.Harbin Inst Technol, Dept Phys, CCMST, Harbin 150001, Peoples R China
2.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore
3.Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China
4.Acad Sinica, Int Ctr Mat Phys, Shenyang 110015, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yang,Sui, Yu,Wang, Xianjie,et al. Thermal conductivity of electron-doped CaMnO3 perovskites: Local lattice distortions and optical phonon thermal excitation[J]. ACTA MATERIALIA,2010,58(19):6306-6316.
APA Wang, Yang,Sui, Yu,Wang, Xianjie,Su, Wenhui,Liu, Xiaoyang,&Fan, Hong Jin.(2010).Thermal conductivity of electron-doped CaMnO3 perovskites: Local lattice distortions and optical phonon thermal excitation.ACTA MATERIALIA,58(19),6306-6316.
MLA Wang, Yang,et al."Thermal conductivity of electron-doped CaMnO3 perovskites: Local lattice distortions and optical phonon thermal excitation".ACTA MATERIALIA 58.19(2010):6306-6316.
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