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Title of Journal: J Supercond Nov Magn

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Abbravation: Journal of Superconductivity and Novel Magnetism

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Springer US

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DOI

10.1007/s10948-012-2061-8

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1557-1947

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Local Structural Properties Around Cu Atoms in Che

Authors: KH Kim HG Lee SW Han
Publish Date: 2013/01/05
Volume: 26, Issue: 5, Pages: 1795-1798
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Abstract

We examined the local structural properties of checkerboard phased Ca2−x Na x CuO2Cl2 T c =0 15 21 27 K using extended Xray absorption fine structure EXAFS measurements at the Cu K edge EXAFS revealed anomalous disorders existing in the bond lengths of Cu–Cu and CuCa/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 baxes were independent of the T c value whereas these of the Cu–Ca/Na pairs located about 30∘ off from the Cu–O abplane decreased as T c increasedThe work at Chonbuk National University was supported by the Basic Science Research Program through the National Research Foundation of Korea government NRF grant funded by the Korean Ministry of Education Science and Technology MEST No 2012R1A1A4A01007669 The XAFS data were collected at the 20BM beamline of APS Argonne National Laboratory and at the 8C beamline of PLS

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