Positron Annihilation Studies in the Sm2/3Sr1/3MnO3+δ
JI Yuan1, CAO Guo-hui1,2,3, 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
Positron Annihilation Studies in the Sm2/3Sr1/3MnO3+δ
JI Yuan1;CAO Guo-hui1,2,3;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
Abstract： We measured lifetime and doppler broadening spectra of Sm2/3Sr1/3MnO3+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 Sm2/3Sr1/3MnO3+δ at Tc. In terms of doppler broadening spectrum, we found the delocalization of low-momentum electrons occurs in Sm2/3Sr1/3MnO3+δ at metal-insulator transition temperature.
JI Yuan;CAO Guo-hui;;LI Yang;MA Qing-zhu;LI Shen;WANG Yun-bo;SHEN Bao-gen. Positron Annihilation Studies in the Sm2/3Sr1/3MnO3+δ[J]. 中国物理快报, 1998, 15(3): 226-227.
JI Yuan, CAO Guo-hui, , LI Yang, MA Qing-zhu, LI Shen, WANG Yun-bo, SHEN Bao-gen. Positron Annihilation Studies in the Sm2/3Sr1/3MnO3+δ. Chin. Phys. Lett., 1998, 15(3): 226-227.
1998, Vol. 15 
