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- Title
Two-site Behavior of Chlorine Atoms in Ca<sub>2− x</sub>Na<sub> x</sub>CuO<sub>2</sub>Cl<sub>2</sub> Single Crystals.
- Authors
Kyung-Hee Kim; Lee, H.-G.; Sung-Ik Lee; Han, S.-W.
- Abstract
The local structural properties of Ca2− xNa xCuO2Cl2 ( x=0.0 and 0.18) single crystals were investigated by using X-ray absorption fine structure (XAFS) measurements at the Cu K edge at the temperature range 10–300 K. XAFS showed that the chemical valence state of the Cu atoms was 2+ and that there are two different bonding lengths between the apical Cl atoms and Cu atoms. The long and short bonding lengths differed by approximately 0.25 Å and their ratio was 1:1 regardless of the temperature for both specimens. The two-site behavior of the apical Cl atoms of the CuO4Cl2 octahedra in the Ca2− xNa xCuO2Cl2 crystals resulted from the removal of degeneracy of the Cu 3 d9 electron ground state, and might be related to two-dimensional charge ordering in the Ca2− xNa xCuO2Cl2 crystals.
- Subjects
CRYSTALLOGRAPHY; PARTICLES (Nuclear physics); CRYSTALS; PHYSICAL &; theoretical chemistry; SOLIDS
- Publication
Journal of Superconductivity & Novel Magnetism, 2010, Vol 23, Issue 3, p391
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-009-0589-z