|
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
Chin. Phys. Lett. 1989, 6 (12):
549-552
.
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.
|
12 articles
|