1. Low temperature Pmmm and C2/m phases in Sr2CuO3+δ high temperature superconductor.
- Author
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Hai-Bo Wang, Zhen-Lin Luo, Yuan-Jun Yang, Qing-Qing Liu, Si-Xia Hu, Meng-Meng Yang, Chang-Qing Jin, and Chen Gao
- Subjects
X-ray absorption near edge structure ,LOW temperatures ,HIGH temperature superconductors ,X-ray absorption - Abstract
A new low temperature Pmmm (120 K) phase was found in high temperature superconductor Sr
2 CuO3+δ , which was indicated as a pure electronic phase by resonant x-ray diffraction at Cu K-edge. As shown by x-ray absorption fine structure (EXAFS) and x-ray absorption near edge structure (XANES) at Cu K-edge, the strong charge density redistribution and local lattice fluctuations around Cu site at the onset of phase transition were due to the occurrence of superconductive coherence, the redistribution and fluctuation finished at Tc . Finally, the electron–lattice interaction was mainly elaborated to understand the superconductivity of Sr2 CuO3+δ . [ABSTRACT FROM AUTHOR]- Published
- 2019
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