Extraordinary Transport Behaviors of La_(0.67)Sr_ ( 0.33)Mn_ (1-x)Cr_xO_3(0.00≤x≤0.30)

作     者：宋启祥 刘宁 严国清 童伟 孙阳 

作者机构：Materials Laboratory Suzhou College Suzhou 234000 China Materials Laboratory Suzhou College Suzhou 234000 China Structure Research Laboratory University of Science and Technology of China Hefei 230026 China Structure Research Laboratory University of Science and Technology of China Hefei 230026 China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2006年第24卷第3期

页      面：332-336页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina(19934003) theStateKeyProjectofFundamentalResearchofChina(001CB610604)andtheNaturalScienceFoundationoftheAnhuiHigherEducationInstitutionsofChina(2006KJ266B) 

主　　题：coherence physics transport CMR effect polycrystalline rare earths 

摘      要：M-T curves, ρ-T curves and MR-T curves of La0.67Sr0.33Mn1-xCrxO3（0.00≤ x ≤0.30） were studied. Experimental results indicate that the substitution of Cr on Mn sites is impotent in driving Tc, but with an increase of Cr content, there appear two peaks in resistivity and MR response, thus the temperature range of CMR response is significantly broadened. The extraordinary transport behavior and the abnormal CMR effect could be the results of coexistence and competition of Mn^3 ＋ -O-Mn^4 ＋ and Mn^3＋ -O-Cr^3 ＋ channels.