THE ELECTRON AND LATTICE PROPERTIES OF SUPERCONDUCTING CERAMICS YBCO-CL

被引:14
作者
AMITIN, EB
BAUSCK, NV
GROMILOV, SA
KOZLOVA, SG
MOROZ, NK
MAZALOV, LN
NAUMOV, VN
SAMOILOV, PP
SLOBODJAN, SA
STARIKOV, MA
FEDOROV, VE
FROLOVA, GI
ERENBURG, SB
机构
[1] Institute of Inorganic Chemistry, Novosibirsk
来源
PHYSICA C | 1993年 / 209卷 / 04期
关键词
D O I
10.1016/0921-4534(93)90553-3
中图分类号
O59 [应用物理学];
学科分类号
摘要
A complex investigation of thermodynamic and structural characteristics, NMR-spectra, Cu K XANES- and X-ray Cu Lalpha fluorescent spectra was carried out on the yttrium ceramics YBa2.01Cu2.92O6.54Cl0.61. The NMR-spectra of these HTSC have shown that the chlorine ions occupy three definite positions in the lattice of the starting yttrium ceramics. Comparison of these data with the neutron diffraction analysis results allowed us to estimate quantitative relations of the distribution of halogen ions among the three positions O(5), O(4) and O(1). It has been shown by XANES-spectroscopy that no considerable amount (more than 10% of sample volume) of the halogen-free phase is observed in the chlorinated ceramics. In this connection some models, widespread in the literature, in which the halogen ions diffusing in the ceramics displace the oxygen and form the oxygen superconducting phase YBa2Cu3O7 inside the crystallite, seem to be erroneous. Analysis of the temperature dependence of the heat capacity allows us to conclude that a considerable increase (by 2-3 times) of the carrier state density near the Fermi level is taking place in the halogenated ceramics. The results of the fluorescent Cu Lalpha X-ray spectra correlate with these conclusions.
引用
收藏
页码:407 / 414
页数:8
相关论文
共 34 条
[1]  
ALEXANDROV OV, 1991, PHYSICA C, V172, P4491
[2]  
AMITIN EB, 1989, SVERCHPROVODIMOSTFCH, V2, P157
[3]   ABINITIO STUDIES OF X-RAY ABSORPTION-EDGE IN COPPER-COMPLEXES .1. ATOMIC CU2+ AND CU(II)CL2 [J].
BAIR, RA ;
GODDARD, WA .
PHYSICAL REVIEW B, 1980, 22 (06) :2767-2776
[4]   A CRITICAL-REVIEW OF SELECTED EXPERIMENTS IN HIGH-TC SUPERCONDUCTIVITY [J].
BATLOGG, B .
PHYSICA B, 1991, 169 (1-4) :7-16
[5]   POLARIZATION DEPENDENCE OF EXAFS AND XANES SPECTRA OF SUPERCONDUCTING FILMS ON THE BASIS OF Y-BA-CU-O [J].
BAUSK, NV ;
MAZALOV, LN ;
RYKOV, AI ;
VRATSKIKH, VF ;
PREDTETCHENSKII, VR ;
VARLAMOV, YD .
BULLETIN OF MATERIALS SCIENCE, 1991, 14 (03) :865-869
[6]  
BAUSK NV, IN PRESS ZH STRUCT C
[7]   SYMMETRY OF THE 3D9 LIGAND HOLE INDUCED BY DOPING IN YBA2CU3O7-DELTA [J].
BIANCONI, A ;
DESANTIS, M ;
DICICCO, A ;
FLANK, AM ;
FONTAINE, A ;
LAGARDE, P ;
KATAYAMAYOSHIDA, H ;
KOTANI, A ;
MARCELLI, A .
PHYSICAL REVIEW B, 1988, 38 (10) :7196-7199
[9]   MULTIPLE-SCATTERING ANALYSIS OF K-EDGE X-RAY-ABSORPTION NEAR-EDGE SPECTRUM OF YBA2CU3O7 [J].
GARG, KB ;
BIANCONI, A ;
DELLALONGA, S ;
CLOZZA, A ;
DESANTIS, M ;
MARCELLI, A .
PHYSICAL REVIEW B, 1988, 38 (01) :244-251
[10]   LATTICE AND ELECTRONIC SPECIFIC-HEAT OF YBA2CU3O7 [J].
GORDON, JE ;
FISHER, RA ;
KIM, S ;
PHILLIPS, NE .
PHYSICA C, 1989, 162 :484-485