Influence of the substitution of Sm, Gd, and Dy for La in La0.7Sr0.3MnO3 on its magnetic and electric properties and strengthening effect on room-temperature CMR

稀土学报(英文版), 2008, 26(6): 821-826.

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

2.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

3.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

4.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

5.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

6.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China;Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China

基金项目: Grand Programme of the Natu-ral Science Research of Education Bureau of Anhui Province(ZD2007003-1) Natural Science Research Programme of Colleges and Universities of Anhui Province(KJ2008A19ZC) Professors' and Doctors' Research Foundation of Suzhou Collge(2006jb02) 国家自然科学基金(19934003)

Influence of the substitution of Sm, Gd, and Dy for La in La0.7Sr0.3MnO3 on its magnetic and electric properties and strengthening effect on room-temperature CMR

SONG Qixiang ^1, , WANG Guiying ^2, , YAN Guoqing ^3, , MAO Qiang ^4, , WANG Wenqi ^5, , PENG Zhensheng ^6,

1.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

2.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

3.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

4.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

5.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China

6.Spin Electronics and Nano-Materials Research laboratory, Suzhou College, Suzhou 234000, China;Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China

Keywords： magnetic and electric properties

A series of La0.7-xSmxSr0.3MnO3, La0.7-xGdxSr0.3MnO3, and La0.7-xDyxSr0.3MnO3 (x=0.00, 0.10, 0.20, 0.30) samples were prepared by the solid-state reaction method. The influence of the substitution of Sm, Gd, and Dy for La on the magnetic and electric properties and on the magnetoresistance (MR) was studied through measurements of M-T curves and p-T curves. The results showed that: lattice distortion in-duced by substitution of Sm, Gd, and Dy for La and extra magnetism of substitution had great influence on the magnetic and electric proper-ties of perovskite manganites; substitution of magnetic rare earth element for La was an effective way to change Curie temperature and to strengthen MR in perovskite manganites; and appropriate substitution proportion would generate large MR near room temperature.

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Influence of the substitution of Sm, Gd, and Dy for La in La0.7Sr0.3MnO3 on its magnetic and electric properties and strengthening effect on room-temperature CMR

参考文献