POSITRON ANNIHILATION IN OXYGEN-DEFICIENT YBa2Cu3O7-δ CUPRATE AT 77 K AND 300 K
作者： Jincang Zhang , Zhenping Chen , Pinglin Li , Shixun Cao , None
DOI: 10.1142/S0217984901003032
关键词: Electron 、 Weak localization 、 Positron 、 Physics 、 Phase transition 、 Cuprate 、 Vacancy defect 、 Electronic structure 、 Superconductivity 、 Condensed matter physics
摘要: The YBa2Cu3O7-δ cuprate with oxygen-deficiency (δ=0.06~0.68) has been systematically studied by positron lifetime experiment at 77 K and 300 K. It is found that there exists an evident dependence of parameters on δ abrupt change near the orthorhombic–tetragonal phase transition. local electron density ne vacancy concentration Cv are evaluated as a function oxygen deficiency δ. effect mechanism charge transfer electronic structure given in detail. results show existence weak localization electrons tetragonal phase. annihilation its relation to superconductivity also discussed.
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sci-hub.se 参考文章(19)
Jincang Zhang, Yujian Cui, Dongmei Deng, Zhenping Chen, Xigui Li, Guosheng Cheng, Characteristic of local electron structure, O–T phase transition and superconductivity for oxygen-deficient YBa2Cu3O7−δ systems Physics Letters A. ,vol. 263, pp. 452- 457 ,(1999) , 10.1016/S0375-9601(99)00760-4
James D. Jorgensen, Defects and Superconductivity in the Copper Oxides Physics Today. ,vol. 44, pp. 34- 40 ,(1991) , 10.1063/1.881304
Bulbul Chakraborty, Positron annihilation in the high-Tc superconductors. Physical Review B. ,vol. 39, pp. 215- 221 ,(1989) , 10.1103/PHYSREVB.39.215
B. Barbiellini, P. Genoud, J. Y. Henry, L. Hoffmann, T. Jarlborg, A. A. Manuel, S. Massidda, M. Peter, W. Sadowski, H. J. Scheel, A. Shukla, A. K. Singh, E. Walker, Positron annihilation on single crystals of YBa 2 Cu 3 O 7-x Physical Review B. ,vol. 43, pp. 7810- 7825 ,(1991) , 10.1103/PHYSREVB.43.7810
Y. C. Jean, C. S. Sundar, A. Bharathi, J. Kyle, H. Nakanishi, P. K. Tseng, P. H. Hor, R. L. Meng, Z. J. Huang, C. W. Chu, Z. Z. Wang, P. E. A. Turchi, R. H. Howell, A. L. Wachs, M. J. Fluss, Local charge-density change and superconductivity: A positron study. Physical Review Letters. ,vol. 64, pp. 1593- 1596 ,(1990) , 10.1103/PHYSREVLETT.64.1593
A Bharathi, C S Sundar, Y Hariharan, A study of positron distribution and annihilation characteristics in YBa2Cu3O7-x Journal of Physics: Condensed Matter. ,vol. 1, pp. 1467- 1474 ,(1989) , 10.1088/0953-8984/1/8/008
ZHANG JINCANG, CHENG GUOSHENG, CAO SHIXUN, LIU FENGQI, LIU JUNZHENG, SHANG JIAXIANG, ELECTRONIC WEAK LOCALIZATION AND SUPERCONDUCTIVITY FOR YBa2Cu3−xAlxOy (x=0−0.4) SYSTEMS: A POSITRON STUDY Modern Physics Letters B. ,vol. 08, pp. 1577- 1585 ,(1994) , 10.1142/S0217984994001539
J. D. Jorgensen, B. W. Veal, W. K. Kwok, G. W. Crabtree, A. Umezawa, L. J. Nowicki, A. P. Paulikas, Structural and superconducting properties of orthorhombic and tetragonal YBa2Cu Physical Review B. ,vol. 36, pp. 5731- 5734 ,(1987) , 10.1103/PHYSREVB.36.5731
V.G. Soloviev, On correlations between reduced neutron widths and partial radiative widths in resonances Physics Letters B. ,vol. 35, pp. 109- 112 ,(1971) , 10.1016/0370-2693(71)90231-0
W. K. Kwok, G. W. Crabtree, A. Umezawa, B. W. Veal, J. D. Jorgensen, S. K. Malik, L. J. Nowicki, A. P. Paulikas, L. Nunez, Electronic behavior of oxygen-deficient YBa2Cu3O7- delta. Physical Review B. ,vol. 37, pp. 106- 110 ,(1988) , 10.1103/PHYSREVB.37.106