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Through measurement of saturation magnetic moment and transport of La0.8Sr0.2Mn1-yCoyO3 (y≤02), the mechanism of magnetoresistance (MR) impacted by Co doping is investigated. The results show that Co3+ is in the low-spin state in La0.8Sr0.2 Mn1-yCoyO3(y≤02). The magnetic exchange interactions of the type Mn3+—O—Co3+—O—Mn3+ is weaker than that of the double exchange interaction between Mn3+-Mn4+, and the magnetoresistance near the Curie temperature TC decreases with the increase of Co concentration. On the contrary, low-temperature magnetoresistance increases with the increase of Co concentration owing to the antiferromagnetic exchange coupling between Co2+ and eg itinerant electron.
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Keywords:
- low-spin /
- magnetoresistance /
- magnetic exchange interaction
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[3] ［3］Tokura Y, Urushibara A, Moritomo Y, Arima T, Asamitsu A, Kido G, Fukukawa N 1994 J. Phys. Soc. Jpn. 63 3931
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[6] ［6］Millis A J, Littlewood P B, Shraiman B I 1995 Phys. Rev. Lett. 74 5144
[7] ［7］Moreo A, Yunoki S, Dagotto E 1999 Science 283 2034
[8] ［8］Li B H, Xianyu W X, Wan X, Zhang J, Shen B G 2000 Acta Phys. Sin. 49 1366 (in Chinese) ［李宝河、鲜于文旭、万欣、张健、沈保根 2000 49 1366］
[9] ［9］Yu Q Y, Jia R R, Jing C, Cao S X, Zhang J C 2008 Chinese J. Low Temp. Phys. 30 106 (in Chinese) ［於乾英、贾蓉蓉、敬超、曹世勋、张金仓 2008 低温 30 106］
[10] ］Jiang K, Gong S K 2009 Chin. Phys. B 18 3035
[11] ］Yuan S L, Yang Y P, Xia Z C, Liu L, Zhang G H, Feng W, Tang J, Zhang L J, Liu S 2002 Phys. Rev. B 66 172402
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[14] ］Zhang J, Tanaka H, Kanki T, Choi J H, Kawai T 2001 Phys. Rev. B 64 184404
[15] ］Yuan Q S 2004 Phys. Rev. B 70 066401
[16] ］Jiang K, Li H F, Gong S K 2006 Acta Phys. Sin. 55 1435 (in Chinese) ［江阔、李合非、宫声凯 2006 55 1435］
[17] ］Jonker G H 1966 J. Appl. Phys. 37 1424
[18] ］Urushibara A, Moritomo Y, Arima T, Asamitsu A, Kido G, Tokura Y 1995 Phys. Rev. B 51 14103
[19] ］Joy P A, Khollam Y B, Date S K 2000 Phys. Rev. B 62 8608
[20] ］Goodenough J B, Wold A, Arnott R J, Menyuk N 1961 Phys. Rev. 124 373
[21] ］Park J H, Cheong S W, Chen C T 1997 Phys. Rev. B 55 11072
[22] ］Blasco J, Garcia J, de Teresa J M, Ibarra M R, Perez J, Algarabel P A, Marquina C 1997 Phys. Rev. B 55 8905
[23] ］Rubinstein M, Gillespie D J, Snyder J E, Tritt T M 1997 Phys.Rev. B 56 5412
[24] ］Ahn K H, Wu X W, Liu K, Chien C L 1996 Phys. Rev. B 54 15299
[25] ］Xi L, Ge S H, Yang X L, Li C X 2004 Acta Phys. Sin. 53 260 (in Chinese) ［席力、葛世慧、杨啸林、李成贤2004 53 260］
[26] ］Feng D, Jin G J 2003 Condensed Matter Physics (Vol. 1) (Beijing: Higher Education Press) p410 (in Chinese) ［冯端、金国钧 2003 凝聚态物理学(上卷) (北京:高等教育出版社) 第410页］
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[1] ［1］Chabara K, Ohno T, Kasai M, Kozono Y 1993 Appl. Phys. Lett. 63 1990
[2] ［2］Jin S, Tiefel T H, McCormack M, Fastnacht R A, Ramesh R, Chen L H 1994 Science 264 413
[3] ［3］Tokura Y, Urushibara A, Moritomo Y, Arima T, Asamitsu A, Kido G, Fukukawa N 1994 J. Phys. Soc. Jpn. 63 3931
[4] ［4］Zener C 1951 Phys. Rev. 82 403
[5] ［5］Anderson P W, Hasegawa H 1955 Phys. Rev. 100 675
[6] ［6］Millis A J, Littlewood P B, Shraiman B I 1995 Phys. Rev. Lett. 74 5144
[7] ［7］Moreo A, Yunoki S, Dagotto E 1999 Science 283 2034
[8] ［8］Li B H, Xianyu W X, Wan X, Zhang J, Shen B G 2000 Acta Phys. Sin. 49 1366 (in Chinese) ［李宝河、鲜于文旭、万欣、张健、沈保根 2000 49 1366］
[9] ［9］Yu Q Y, Jia R R, Jing C, Cao S X, Zhang J C 2008 Chinese J. Low Temp. Phys. 30 106 (in Chinese) ［於乾英、贾蓉蓉、敬超、曹世勋、张金仓 2008 低温 30 106］
[10] ］Jiang K, Gong S K 2009 Chin. Phys. B 18 3035
[11] ］Yuan S L, Yang Y P, Xia Z C, Liu L, Zhang G H, Feng W, Tang J, Zhang L J, Liu S 2002 Phys. Rev. B 66 172402
[12] ］Li G, Tang P, Sun X, Jiang Y, Chen Y, Wang S, Huang Z, Yuan S L 1999 Acta Phys. Sin. 48 505 (in Chinese) ［李广、汤萍、孙霞、姜勇、陈岳、王胜、黄真、袁松柳 1999 48 505］
[13] ］Joseph Joly V L, Joy P A, Date S K, Gopinath C S 2002 Phys. Rev. B 65 184416
[14] ］Zhang J, Tanaka H, Kanki T, Choi J H, Kawai T 2001 Phys. Rev. B 64 184404
[15] ］Yuan Q S 2004 Phys. Rev. B 70 066401
[16] ］Jiang K, Li H F, Gong S K 2006 Acta Phys. Sin. 55 1435 (in Chinese) ［江阔、李合非、宫声凯 2006 55 1435］
[17] ］Jonker G H 1966 J. Appl. Phys. 37 1424
[18] ］Urushibara A, Moritomo Y, Arima T, Asamitsu A, Kido G, Tokura Y 1995 Phys. Rev. B 51 14103
[19] ］Joy P A, Khollam Y B, Date S K 2000 Phys. Rev. B 62 8608
[20] ］Goodenough J B, Wold A, Arnott R J, Menyuk N 1961 Phys. Rev. 124 373
[21] ］Park J H, Cheong S W, Chen C T 1997 Phys. Rev. B 55 11072
[22] ］Blasco J, Garcia J, de Teresa J M, Ibarra M R, Perez J, Algarabel P A, Marquina C 1997 Phys. Rev. B 55 8905
[23] ］Rubinstein M, Gillespie D J, Snyder J E, Tritt T M 1997 Phys.Rev. B 56 5412
[24] ］Ahn K H, Wu X W, Liu K, Chien C L 1996 Phys. Rev. B 54 15299
[25] ］Xi L, Ge S H, Yang X L, Li C X 2004 Acta Phys. Sin. 53 260 (in Chinese) ［席力、葛世慧、杨啸林、李成贤2004 53 260］
[26] ］Feng D, Jin G J 2003 Condensed Matter Physics (Vol. 1) (Beijing: Higher Education Press) p410 (in Chinese) ［冯端、金国钧 2003 凝聚态物理学(上卷) (北京:高等教育出版社) 第410页］
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