Study of superconducting and non-superconducting (Cu,Cr)-1212 compounds byhigh-resolution TEM and electron energy loss spectroscopy

Citation
Y. Anan et al., Study of superconducting and non-superconducting (Cu,Cr)-1212 compounds byhigh-resolution TEM and electron energy loss spectroscopy, PHYSICA C, 357, 2001, pp. 371-375
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA C
ISSN journal
0921-4534 → ACNP
Volume
357
Year of publication
2001
Part
1
Pages
371 - 375
Database
ISI
SICI code
0921-4534(200108)357:<371:SOSAN(>2.0.ZU;2-U
Abstract
Structure of YSr2-xBaxCu2.8Cr0.2Oy (x = 0-1.5) superconductors are examined by electron diffraction, HRTEM and electron energy loss spectroscopy (EELS ). YSr2Cu2.8Cr0.2Oy (x = 0) shows incommensurate superstructure with 3.67a( 0) due to lattice strain and mixed intergrowth of -(Cr-Cu-Cu-Cu-Cr)- and -( Cr-Cu-Cu-Cr)- sequences. In the h0l electron diffraction pattern the waveve ctor [similar to 0.27, 0, 1/2] due to the incommensurate superstructure dis appear in the crystal with high Ba contain (x greater than or equal to 1.0) . This suggests that structural distortion decreases with Ba substitution. At the same time, Cr-L3, L2 edge of EELS spectra shifts toward low-energy s ide with increase of Ba content. (C) 2001 Elsevier Science B.V. All rights reserved.