POSITRON ANNIHILATION STUDY OF PHASE TRANSITION IN HIGH-TEMPERATURE SUPERCONDUCTOR Y-Ba-Cu-O

ZHANG Duan-Ming; LI Guo-Yuan; WANG Jian-An; HE Yuan-Jin

Chinese Physics C> 1989, Vol. 13> Issue(9) : 769-771

POSITRON ANNIHILATION STUDY OF PHASE TRANSITION IN HIGH-TEMPERATURE SUPERCONDUCTOR Y-Ba-Cu-O

Department of Physics,Huazhong Univ of Sci & Tech,Wuhan1 Department of Mordern Applied Physics,Tsinghua Univ,Beijing

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Abstract：
The resistance,positron lifetime spectra and the Doppler broadening energy spectra of high T_c supercondoctor Y-Ba-Cu-O are measured simultaneously near the phase transition temperature.It is shown that the critical temperature of the material is about 90°K,and the positron annihilation mean lifetime m as well as the Doppler broadening parmeters H and S are in a state of irregular vibration within the phase transition region.This pheuomenon may probaley relate to the instability of the crystal structure,and seems supporting the uperconducting mechanism in which the bipolaron theory a major role.

References

[1]	Y. C. Jenn et al.,Phys. Rev.B,Vol.36,No.7.(1987), p.3994.[2] S. J. Wang et al.,Phys. Rev.B, Vol.37,No. 1,(1988),p.603[3] B. Chakraverty, J. Physique, Vol. 42, No. 9,(1981), p,35.[4] A. Alexandrov and J.Ranniger,Phys,Rev. B,Vol,23,No.4,(1981), p.1796

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ZHANG Duan-Ming, LI Guo-Yuan, WANG Jian-An and HE Yuan-Jin. POSITRON ANNIHILATION STUDY OF PHASE TRANSITION IN HIGH-TEMPERATURE SUPERCONDUCTOR Y-Ba-Cu-O[J]. Chinese Physics C, 1989, 13(9): 769-771.

ZHANG Duan-Ming, LI Guo-Yuan, WANG Jian-An and HE Yuan-Jin. POSITRON ANNIHILATION STUDY OF PHASE TRANSITION IN HIGH-TEMPERATURE SUPERCONDUCTOR Y-Ba-Cu-O[J]. Chinese Physics C, 1989, 13(9): 769-771. shu

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Received: 1900-01-01
Revised: 1900-01-01

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