Open AccessBOND VALENCE CHARACTER AND SUPERCONDUCTIVITY IN Y1-xPrxBa2Cu3O7-δ SYSTEM
Author(s) -
Xiaojun Zhang,
Jinsong Wang,
Z. A. Xu,
Qirui Zhang
Publication year - 1993
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.42.1985
Subject(s) - valence (chemistry) , superconductivity , ion , neutron diffraction , electrical resistivity and conductivity , materials science , condensed matter physics , quenching (fluorescence) , bond length , crystallography , analytical chemistry (journal) , physics , chemistry , crystal structure , quantum mechanics , chromatography , fluorescence
Based on data of neutron diffraction measurements, the oxidation states in Y1-xPrxBa2Cu3O7-δ system are determined by bond valence sums (BVS) calculation. It is found that a close correlation between the BVS value of Cu(2) and superconducting critical temperature (Tc) exists. We believe that the increase of Pr content leads to the variation of charge distribution when the content of oxygen remains almost constant. At the same time ,the BVS value of Cu(l) and Cu(2) decreases,while that of Y(Pr) increases,and the holes in CuO2 plane are partly localized in Pr-O bond. The quenching of superconductivity by Pr ions is mainly attributed to this localization of the holes in CuO2 plane by Pr ions.