Local structural properties around cu atoms in checkerboard phased Ca2−xNaxCuO2Cl2

K. H. Kim; H. G. Lee; S. W. Han

doi:10.1007/s10948-012-2061-8

Local structural properties around cu atoms in checkerboard phased Ca_2−xNa_xCuO₂Cl₂

K. H. Kim
, H. G. Lee
, S. W. Han^*

^*Corresponding author for this work

Physics Education

Pohang University of Science and Technology

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

Abstract

We examined the local structural properties of checkerboard phased Ca₂_−xNa_xCuO₂Cl₂ (T_c = 0, 15, 21, 27 K) using extended X-ray absorption fine structure (EXAFS) measurements at the Cu K edge. EXAFS revealed anomalous disorders existing in the bond lengths of Cu–Cu and Cu-Ca/Na pairs for all crystals below 50 K. A static disorder was observed even at room temperature. The disorders of the Cu–Cu in the a- and b-axes were independent of the T_c value whereas these of the Cu–Ca/Na pairs located about 30◦ off from the Cu–O, ab-plane decreased, as T_c increased.

Original language	English
Pages (from-to)	1795-1798
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	26
Issue number	5
DOIs	https://doi.org/10.1007/s10948-012-2061-8
State	Published - 2013.05

Keywords

Checkerboard phase
EXAFS
NaCCOC
Structure
Superconductivity

Quacquarelli Symonds(QS) Subject Topics

Materials Science
Physics & Astronomy

Access to Document

10.1007/s10948-012-2061-8

Cite this

@article{543d933efd0642be8b8e63d081eb1dba,

title = "Local structural properties around cu atoms in checkerboard phased Ca2−xNaxCuO2Cl2",

abstract = "We examined the local structural properties of checkerboard phased Ca2−xNaxCuO2Cl2 (Tc = 0, 15, 21, 27 K) using extended X-ray absorption fine structure (EXAFS) measurements at the Cu K edge. EXAFS revealed anomalous disorders existing in the bond lengths of Cu–Cu and Cu-Ca/Na pairs for all crystals below 50 K. A static disorder was observed even at room temperature. The disorders of the Cu–Cu in the a- and b-axes were independent of the Tc value whereas these of the Cu–Ca/Na pairs located about 30◦ off from the Cu–O, ab-plane decreased, as Tc increased.",

keywords = "Checkerboard phase, EXAFS, NaCCOC, Structure, Superconductivity",

author = "Kim, \{K. H.\} and Lee, \{H. G.\} and Han, \{S. W.\}",

note = "Publisher Copyright: {\textcopyright} Springer Science+Business Media New York 2012.",

year = "2013",

month = may,

doi = "10.1007/s10948-012-2061-8",

language = "English",

volume = "26",

pages = "1795--1798",

journal = "Journal of Superconductivity and Novel Magnetism",

issn = "1557-1939",

number = "5",

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TY - JOUR

T1 - Local structural properties around cu atoms in checkerboard phased Ca2−xNaxCuO2Cl2

AU - Kim, K. H.

AU - Lee, H. G.

AU - Han, S. W.

N1 - Publisher Copyright: © Springer Science+Business Media New York 2012.

PY - 2013/5

Y1 - 2013/5

N2 - We examined the local structural properties of checkerboard phased Ca2−xNaxCuO2Cl2 (Tc = 0, 15, 21, 27 K) using extended X-ray absorption fine structure (EXAFS) measurements at the Cu K edge. EXAFS revealed anomalous disorders existing in the bond lengths of Cu–Cu and Cu-Ca/Na pairs for all crystals below 50 K. A static disorder was observed even at room temperature. The disorders of the Cu–Cu in the a- and b-axes were independent of the Tc value whereas these of the Cu–Ca/Na pairs located about 30◦ off from the Cu–O, ab-plane decreased, as Tc increased.

AB - We examined the local structural properties of checkerboard phased Ca2−xNaxCuO2Cl2 (Tc = 0, 15, 21, 27 K) using extended X-ray absorption fine structure (EXAFS) measurements at the Cu K edge. EXAFS revealed anomalous disorders existing in the bond lengths of Cu–Cu and Cu-Ca/Na pairs for all crystals below 50 K. A static disorder was observed even at room temperature. The disorders of the Cu–Cu in the a- and b-axes were independent of the Tc value whereas these of the Cu–Ca/Na pairs located about 30◦ off from the Cu–O, ab-plane decreased, as Tc increased.

KW - Checkerboard phase

KW - EXAFS

KW - NaCCOC

KW - Structure

KW - Superconductivity

UR - https://www.scopus.com/pages/publications/84959248849

U2 - 10.1007/s10948-012-2061-8

DO - 10.1007/s10948-012-2061-8

M3 - Journal article

AN - SCOPUS:84959248849

SN - 1557-1939

VL - 26

SP - 1795

EP - 1798

JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

IS - 5

ER -