Local oxygen ordering in superconducting YBa2Cu306.4 observed by neutron diffraction

Nature ◽  
1991 ◽  
Vol 353 (6344) ◽  
pp. 542-544 ◽  
Author(s):  
Thomas Zeiske ◽  
Rainer Sonntag ◽  
Dietmar Hohlwein ◽  
Niels Hessel Andersen ◽  
Thomas Wolf
Keyword(s):  
Neutron Diffraction ◽  
Oxygen Ordering ◽  
Local Oxygen

Neutron-diffraction studies on the time dependence of the oxygen ordering inLa2NiO4.105

1995 ◽  
Vol 51 (5) ◽  
pp. 3176-3180 ◽  
Author(s):  
J. E. Lorenzo ◽  
J. M. Tranquada ◽  
D. J. Buttrey ◽  
V. Sachan
Keyword(s):  
Neutron Diffraction ◽  
Time Dependence ◽  
Oxygen Ordering

Neutron Diffraction Studies of High TC Superconductors

1987 ◽  
Vol 99 ◽  
Author(s):  
D. G. Hinks ◽  
B. Dabrowski ◽  
K. Zhang ◽  
C. U. Segre ◽  
J. D. Jorgensen ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Complex Function ◽  
Electronic Effects ◽  
High Tc Superconductors ◽  
High Tc ◽  
Oxygen Ordering ◽  
Powder Neutron Diffraction

ABSTRACTWe have investigated the structure and composition of La2CuO4 (both pure and Sr-doped) and Nd(Ba2−xNdx)Cu3O7 using powder neutron diffraction. In La2−xSrxCuO4, Tc reacnes its maximum at x=0.15, after which vacancies are introduced in the 2D planes and superconductivity is destroyed. Superconductivity in La2CuO4 is not bulk. No evidence for nonstoichlometry in this material can be observed. In the Nd(Ba2−xNdx)Cu3O7 system, Tc is a complex function of oxygen ordering and electronic effects.

Neutron diffraction study of Pr valence and oxygen ordering in the Y1−xPrxBa2Cu3O7−δ system

1990 ◽  
Vol 166 (1-2) ◽  
pp. 191-196 ◽  
Author(s):  
J.J. Neumeier ◽  
T. Bjørnholm ◽  
M.B. Maple ◽  
J.J. Rhyne ◽  
J.A. Gotaas
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Study ◽  
Neutron Diffraction Study ◽  
Oxygen Ordering

Raman study of ortho-II phase of the YBa2Cu3O7−δ single crystal: Role of local oxygen ordering in the doping

1994 ◽  
Vol 92 (11) ◽  
pp. 877-882 ◽  
Author(s):  
O.V. Misochko ◽  
S. Tajima ◽  
S. Miyamoto ◽  
N. Koshizuka
Keyword(s):  
Single Crystal ◽  
Oxygen Ordering ◽  
Raman Study ◽  
Local Oxygen

Local oxygen ordering and superconductivity in Bi2Sr2Can−1CunO2n+4+δ (n=1,2)

1994 ◽  
Vol 235-240 ◽  
pp. 1257-1258
Author(s):  
L. Vasiliu-Doloc ◽  
A.H. Moudden ◽  
N. Blanchard ◽  
F. Lévy ◽  
J. Doucet
Keyword(s):  
Oxygen Ordering ◽  
Local Oxygen

First observation of superstructure reflections by neutron diffraction due to oxygen ordering inYBa2Cu3O6.35

1991 ◽  
Vol 66 (11) ◽  
pp. 1497-1500 ◽  
Author(s):  
R. Sonntag ◽  
D. Hohlwein ◽  
T. Brückel ◽  
G. Collin
Keyword(s):  
Neutron Diffraction ◽  
Oxygen Ordering

Effects of local oxygen ordering on superconducting properties of YBa2Cu3O7−x

1990 ◽  
Vol 48 (4) ◽  
pp. 16-17
Author(s):  
Bradley L. Thiel ◽  
Mehmet Sarikaya ◽  
Jafar Javadpour ◽  
Ilhan A. Aksay
Keyword(s):  
Critical Factor ◽  
Nanometer Scale ◽  
Superconducting Properties ◽  
Orthorhombic Unit Cell ◽  
Oxygen Ordering ◽  
Deconvolution Technique ◽  
Superconducting Ceramics ◽  
Diffraction Patterns ◽  
Image Position ◽  
Local Oxygen

The amount of oxygen in high temperature superconducting ceramics is generally recognized as a critical factor affecting the superconducting properties. In this work, nanometer-scale variations in the oxygen ordering of powdered YBa2Cu3O7−x samples, having nominally identical oxygen contents, have been quantified using a novel deconvolution technique on electron diffraction patterns. These variations were correlated with the superconducting properties as studied by magnetic flux exclusion.Microdensitometer traces of the twin-split (110) type spots in the orientation were deconvoluted to extract the orthorhombicity distribution within the diffracting region. The deconvolution process is shown schematically in Fig. 1. The orthorhombicity is defined as:where a and b are lattice parameters of the orthorhombic unit cell on the Cu-O basal plane. In the samples studied, materials showing the highest Δa/a (about 2.05%) were also those that displayed the highest Tc values. Furthermore, the width of the superconducting onset, ΔTC, reflected the width of the Δa/a distribution.

Texture measurements in Al2O3 using BEKP

1994 ◽  
Vol 52 ◽  
pp. 608-609
Author(s):  
M. D. Vaudin ◽  
J. P. Cline
Keyword(s):  
Neutron Diffraction ◽  
Rapid Method ◽  
Crystallographic Orientation ◽  
Specimen Surface ◽  
X Ray Diffraction ◽  
Anisotropic Crystal ◽  
X Ray ◽  
Verification Method ◽  
Crystal Properties ◽  
Backscattered Electron

The study of preferred crystallographic orientation (texture) in ceramics is assuming greater importance as their anisotropic crystal properties are being used to advantage in an increasing number of applications. The quantification of texture by a reliable and rapid method is required. Analysis of backscattered electron Kikuchi patterns (BEKPs) can be used to provide the crystallographic orientation of as many grains as time and resources allow. The technique is relatively slow, particularly for noncubic materials, but the data are more accurate than any comparable technique when a sufficient number of grains are analyzed. Thus, BEKP is well-suited as a verification method for data obtained in faster ways, such as x-ray or neutron diffraction. We have compared texture data obtained using BEKP, x-ray diffraction and neutron diffraction. Alumina specimens displaying differing levels of axisymmetric (0001) texture normal to the specimen surface were investigated.BEKP patterns were obtained from about a hundred grains selected at random in each specimen.

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