Topic
Valency
About: Valency is a research topic. Over the lifetime, 1632 publications have been published within this topic receiving 26141 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: The role of oxygen vacancies in high Tc superconductivity of Ba 2 YCu 3 O y (6.22 c) to low T c (50-60 K) states at the critical oxygen content y=6.7 is strongly related with the local structure and Cu valency as mentioned in this paper.
Abstract: The role of oxygen vacancies in high Tc superconductivity of Ba 2 YCu 3 O y (6.22 c (90 K) to low T c (50–60 K) states at the critical oxygen content y=6.7 is strongly related with the local structure and Cu valency. Extended x-ray absorption fine structure (EXAFS) results indicate that oxygen ordering in the O1-Cu1-O1 linear chain predominantly influences the structure along the c-axis and the Cu-0 vibrational properties of CuO 2 planes. The near-edge spectra indicate that Cu + species are formed at Cul sites below the critical oxygen content, suggesting that the presence of Cu d-hole on the O1-Cu1-O1 chain is essential for high T c (90 K) superconductivity.
1 citations
Dissertation•
01 Jan 1980
1 citations
31 Dec 1991
1 citations