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TEMPERATURE DEPENDENCE OF POSITRON ANNIHILATION PARAMETERS IN HIGH Tc SUPERCONDUCTOR YBa2Cu3O7-x
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LI Anli;ZHENG Shengnan;HUANG Hanchen;LI Donghong;DU Hongshan;DIN Honglin;SUN Hancheng;ZHU Shengyun
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Institute of Atomic Energy, Beijing 102413 |
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Cite this article: |
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.
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Keywords:
74.10.+v
61.80.Fe
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Published: 01 December 1989
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PACS: |
74.10.+v
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(Occurrence, potential candidates)
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61.80.Fe
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(Electron and positron radiation effects)
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