Chin. Phys. Lett.  1989, Vol. 6 Issue (12): 549-552    DOI:
Original Articles |
TEMPERATURE DEPENDENCE OF POSITRON ANNIHILATION PARAMETERS IN HIGH Tc SUPERCONDUCTOR YBa2Cu3O7-x
LI Anli;ZHENG Shengnan;HUANG Hanchen;LI Donghong;DU Hongshan;DIN Honglin;SUN Hancheng;ZHU Shengyun
Institute of Atomic Energy, Beijing 102413
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LI Anli, ZHENG Shengnan, HUANG Hanchen et al  1989 Chin. Phys. Lett. 6 549-552
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Abstract The temperature dependences of the positron annihilation lifetime and the Doppler broadening shape parameters have been measured in high Tc superconductors YBa2Cu3O7-x = between 77.2 and 300K. The measured parameters show an abrupt change across the range of superconducting transition temperature, indicating a change of the electronic structure. The structural instabilities have also been observed in three higher temperature ranges of115-135, 150-210 and 250-280K. This suggests that higher Tc superconductors might be found in these temperature ranges.

Keywords: 74.10.+v      61.80.Fe     
Published: 01 December 1989
PACS:  74.10.+v (Occurrence, potential candidates)  
  61.80.Fe (Electron and positron radiation effects)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y1989/V6/I12/0549
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LI Anli
ZHENG Shengnan
HUANG Hanchen
LI Donghong
DU Hongshan
DIN Honglin
SUN Hancheng
ZHU Shengyun
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