Positron Annihilation Studies on La1-xSrxMnO3 Manganites

Yu Yang Huang; Yan Meng; Wen Hua Huang; Shou Lei Xu; Ding Kang Xiong; Wen Deng

doi:10.4028/www.scientific.net/DDF.373.201

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Positron Annihilation Studies on La_1-xSr_xMnO₃ Manganites

Abstract:

Positron lifetime and coincidence Doppler broadening spectra of La_1-_xSr_xMnO₃ and LaMnO₃ manganites were measured. The effects of Sr contents on the microdefects of La_1-_xSr_xMnO₃ were investigated by means of positron lifetime results. The signals of 3d electrons of La_1-_xSr_xMnO₃ were extracted from the coincidence Doppler broadening spectra. The results show that the electron density of La_1-_xSr_xMnO₃ is larger than that of LaMnO₃. The open volume of the defect in La_1-_xSr_xMnO₃ increases with the Sr contents. The signals of 3d electrons of ferromagnetic La_1-_xSr_xMnO₃ is larger than that of antiferromagnetic LaMnO₃, and it reaches the maximum at x=0.33, that is, the signals of 3d electrons of the La_0.67Sr_0.33MnO₃ is the highest in all testing samples, which corresponds to a lowest resistivity and a higher Curie temperature of the manganite. The influence of 3d electrons on the ferromagnetic double-exchange coupling and anti-ferromagnetic coupling of La_1-_xSr_xMnO₃ were discussed.

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Periodical:

Defect and Diffusion Forum (Volume 373)

Pages:

201-204

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.373.201

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Online since:

March 2017

Authors:

Yu Yang Huang*, Yan Meng, Wen Hua Huang, Shou Lei Xu, Ding Kang Xiong, Wen Deng

Keywords:

3d Electron, Double-Exchange Coupling, Manganites, Microdefect, p-d Hybridization

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