Two-site behavior of chlorine atoms in Ca 2-x Na x CuO 2Cl 2 single crystals

Kyung Hee Kim; H. G. Lee; Sung Ik Lee; S. W. Han

doi:10.1007/s10948-009-0589-z

Two-site behavior of chlorine atoms in Ca _2-x Na _x CuO ₂Cl ₂ single crystals

Kyung Hee Kim
, H. G. Lee
, Sung Ik Lee
, S. W. Han^*

^*Corresponding author for this work

Physics Education

Pohang University of Science and Technology
Sogang University

Research output: Contribution to journal › Journal article › peer-review

2 Scopus citations

Abstract

The local structural properties of Ca _2-x Na _x CuO ₂Cl ₂ (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 CuO ₄Cl ₂ octahedra in the Ca _2-x Na _x CuO ₂Cl ₂ crystals resulted from the removal of degeneracy of the Cu 3d ⁹ electron ground state, and might be related to two-dimensional charge ordering in the Ca _2-x Na _x CuO ₂Cl ₂ crystals.

Original language	English
Pages (from-to)	391-395
Number of pages	5
Journal	Journal of Superconductivity and Novel Magnetism
Volume	23
Issue number	3
DOIs	https://doi.org/10.1007/s10948-009-0589-z
State	Published - 2010.04

Keywords

Charge ordering
NaCCOC
Structure
Superconductivity
XAFS

Quacquarelli Symonds(QS) Subject Topics

Materials Science
Physics & Astronomy

Access to Document

10.1007/s10948-009-0589-z

Cite this

@article{a939f631c32246c7b042449c30bb148c,

title = "Two-site behavior of chlorine atoms in Ca 2-x Na x CuO 2Cl 2 single crystals",

abstract = "The local structural properties of Ca 2-x Na x CuO 2Cl 2 (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 {\AA} and their ratio was 1:1 regardless of the temperature for both specimens. The two-site behavior of the apical Cl atoms of the CuO 4Cl 2 octahedra in the Ca 2-x Na x CuO 2Cl 2 crystals resulted from the removal of degeneracy of the Cu 3d 9 electron ground state, and might be related to two-dimensional charge ordering in the Ca 2-x Na x CuO 2Cl 2 crystals.",

keywords = "Charge ordering, NaCCOC, Structure, Superconductivity, XAFS",

author = "Kim, \{Kyung Hee\} and Lee, \{H. G.\} and Lee, \{Sung Ik\} and Han, \{S. W.\}",

year = "2010",

month = apr,

doi = "10.1007/s10948-009-0589-z",

language = "English",

volume = "23",

pages = "391--395",

journal = "Journal of Superconductivity and Novel Magnetism",

issn = "1557-1939",

number = "3",

}

TY - JOUR

T1 - Two-site behavior of chlorine atoms in Ca 2-x Na x CuO 2Cl 2 single crystals

AU - Kim, Kyung Hee

AU - Lee, H. G.

AU - Lee, Sung Ik

AU - Han, S. W.

PY - 2010/4

Y1 - 2010/4

N2 - The local structural properties of Ca 2-x Na x CuO 2Cl 2 (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 CuO 4Cl 2 octahedra in the Ca 2-x Na x CuO 2Cl 2 crystals resulted from the removal of degeneracy of the Cu 3d 9 electron ground state, and might be related to two-dimensional charge ordering in the Ca 2-x Na x CuO 2Cl 2 crystals.

AB - The local structural properties of Ca 2-x Na x CuO 2Cl 2 (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 CuO 4Cl 2 octahedra in the Ca 2-x Na x CuO 2Cl 2 crystals resulted from the removal of degeneracy of the Cu 3d 9 electron ground state, and might be related to two-dimensional charge ordering in the Ca 2-x Na x CuO 2Cl 2 crystals.

KW - Charge ordering

KW - NaCCOC

KW - Structure

KW - Superconductivity

KW - XAFS

UR - https://www.scopus.com/pages/publications/77649236636

U2 - 10.1007/s10948-009-0589-z

DO - 10.1007/s10948-009-0589-z

M3 - Journal article

AN - SCOPUS:77649236636

SN - 1557-1939

VL - 23

SP - 391

EP - 395

JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

IS - 3

ER -