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Low temperature Pmmm and C2/m phases in Sr2CuO3+δ high temperature superconductor
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作者 王海波 罗震林 +5 位作者 杨远俊 刘清青 胡思 杨蒙蒙 靳常青 高琛 《中国物理B:英文版》 SCIE EI CAS CSCD 2019年第5期206-209,共4页
A new low temperature Pmmm (120 K) phase was found in high temperature superconductor Sr2CuO3+δ,which was indicated as a pure electronic phase by resonant x-ray diffraction at Cu K-edge.As shown by x-ray absorption f... A new low temperature Pmmm (120 K) phase was found in high temperature superconductor Sr2CuO3+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 Sr2CuO3+δ. 展开更多
关键词 RESONANT X-RAY diffraction X-RAY absorption fine structure MODULATED phase SUPERCONDUCTIVITY
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