HighT c superconductivity in YBa2Cu3O7−x studied by PAC and PAS |
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| Authors: | Shengyun Zhu Anli Li Shengnan Zheng Hanchen Huang Donghong Li Honglin Din Hongshan Du Hancheng Sun |
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| Affiliation: | (1) China Institute of Atomic Energy, PO Box 275, 102413 Beijing, People's Republic of China |
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| Abstract: | HighTc superconductivity has been investigated in YBaCuO by both perturbed angular correlation and positron annihilation spectroscopy techniques as a function of temperature from 77 to 300 K. An abrupt change has been observed in the positron lifetime and Doppler broadening and the electric field gradient and its asymmetry parameter acrossTc, indicating a transition of two- to one-dimensional Cu-O-Cu chain structure and a charge transfer from CuO layers to CuO chains. An anomaly of the normal state has been demonstrated around 125 K, which is attributed to the structural instability. |
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