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 

机构地区：[1]Materials Laboratory, Suzhou College, Suzhou 234000, China [2]Materials Laboratory, Suzhou College, Suzhou 234000, China, Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China [3]Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China

出　　处：《Journal of Rare Earths》2006年第3期332-336,共5页稀土学报（英文版）

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

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.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.

关 键 词：coherence physics TRANSPORT CMR effect POLYCRYSTALLINE rare earths 

分 类 号：TM27[一般工业技术—材料科学与工程]