Positron Annihilation Studies in the Sm2/3Sr1/3MnO3+δ

Chin. Phys. Lett.

1998, Vol. 15

Issue (3): 226-227 DOI:

Original Articles

Positron Annihilation Studies in the Sm_2/3Sr_1/3MnO_3+δ

JI Yuan¹;CAO Guo-hui^1,2,3;LI Yang¹;MA Qing-zhu¹;LI Shen¹;WANG Yun-bo²;SHEN Bao-gen³

¹University of Science and Technology Beijing, Beijing 100083 ²Institute of High Energy Physics, Chinese Academy of Sciences, 100080 ³State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080

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JI Yuan, CAO Guo-hui, LI Yang et al 1998 Chin. Phys. Lett. 15 226-227

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Abstract We measured lifetime and doppler broadening spectra of Sm_2/3Sr_1/3MnO_3+δ as functions of temperature by positron annihilation technology In terms of lifetime spectrum, we found that the lattice effects triggered by ferromagnetic transition give rise to the change of the coefficient of the average linear thermal expansion of Sm_2/3Sr_1/3MnO_3+δ at T_c. In terms of doppler broadening spectrum, we found the delocalization of low-momentum electrons occurs in Sm_2/3Sr_1/3MnO_3+δ at metal-insulator transition temperature.

Keywords: 78.70.Bj 75.60.Ej 77.80.Bh

Published: 01 March 1998

PACS:	78.70.Bj	(Positron annihilation)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	77.80.Bh

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y1998/V15/I3/0226

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