LA1BA2CU3O9-γ: Structural Analysis as Determined by Neutron Diffraction

1987 ◽  
Vol 99 ◽  
Author(s):  
J. P. Golben ◽  
YI Song ◽  
S. Chittipeddi ◽  
S. I. Lee ◽  
R. D. Mcmichael ◽  
...  
Keyword(s):  
High Temperature ◽  
Structural Analysis ◽  
Neutron Diffraction ◽  
Special Interest ◽  
Superconducting Phase ◽  
High Tc ◽  
High Tc Superconductivity ◽  
High Temperature Superconducting ◽  
Zero Resistance ◽  
Rule Out

The La-Ba-Cu-O system contains several phases of special interest in the field of high Tc superconductivity. Specifically intriguing is the La3−xBa3+xCu6O4+y (“3–3–6”) phase [1,2], the La1·8 5Ba·1 5CuO4 (‘K2NiF4’) phase with a zero resistance temperature (Tc) of about 20 K [3,4], and the La1Ba2CU3O9–6 (“1–2–3”) phase with Tc's reported up to 75 K [5–7]. It has been suggested that the “3–3–6” phase may also be superconducting, especially in a Ba-doped version such that the stoichiometry is 2–4–6 [8–10]. In addition to defining a new high temperature superconducting phase, this latter suggestion would also rule out the possibility of Cu-0 “chains” being important to 90 K superconductivity since these chains are absent in the proposed configuration [1,2] of this phase.

EXPERIMENTAL STUDY OF THE HIGH Tc SUPERCONDUCTOR Y-Ba-Cu-O SYSTEM

1989 ◽  
Vol 03 (08) ◽  
pp. 661-664
Author(s):  
S.M.M.R. NAQVI ◽  
JAWAID ALAM ◽  
FIROZ AHMAD ◽  
MUSHEER HASAN KHAN
Keyword(s):  
Experimental Study ◽  
Superconducting Phase ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
High Tc Superconductor ◽  
Zero Resistance

Two batches of Y-Ba-Cu-O superconductors have been prepared. The zero resistance temperature is 90 K with Tc onset at 93 K and 95 K, respectively. Susceptibility measurements show superconducting phase at LN2. X-ray diffraction results indicates single phases.

Granular Aspects of High Tc Superconductivity

1990 ◽  
Vol 195 ◽  
Author(s):  
Guy Deutscher
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Original Publication ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Bulk Ceramic ◽  
Ceramic Samples ◽  
Granular Superconductors

ABSTRACTAs Bednorz and Muller noted in their original publication reporting on the discovery of high temperature superconductivity, their oxides present many of the features of granular superconductors. This behavior was first primarily ascribed to poor connectivity of the grains in the bulk ceramic samples. but later studies have pointed out to more fundamental reasons for these similarities. We will discuss them after first reviewing the well established properties of low Tc granular superconductors.

X-ray powder diffraction data for the superconducting phase Tl0.5Pb0.5Sr2CaCu2O6.5+δ

1993 ◽  
Vol 8 (4) ◽  
pp. 249-250 ◽  
Author(s):  
Chan Park ◽  
Robert L. Snyder
Keyword(s):  
High Temperature ◽  
Molten Salt ◽  
Diffraction Pattern ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Superconducting Phase ◽  
Powder Diffraction Data ◽  
X Ray ◽  
High Temperature Superconducting

The X-ray powder diffraction pattern for a sample of the high-temperature superconducting phase Tl0.5Pb0.5Sr2CaCu2O6.5+δ has been determined. The sample was prepared by a molten salt technique and had a Tc of 96 K.

SUPERCONDUCTING PROPERTIES OF THE HIGH Tc SUPERCONDUCTING Er-Ba-Cu-O COMPOUND

1989 ◽  
Vol 03 (03) ◽  
pp. 441-444 ◽  
Author(s):  
S. M. M. R. NAQVI ◽  
FIROZ AHMAD ◽  
JAWAID ALAM ◽  
SHARFUDDIN AHMAD
Keyword(s):  
Superconducting Phase ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
Zero Resistance ◽  
Two Phases

Two batches of Er-Ba-Cu-O superconductors have been prepared. The zero resistance temperature is 86 K with T c onsets at 99 K and 92 K respectively. Susceptibility measurements show superconducting phase at LN 2. X-ray diffraction results indicates two phases, the superconducting being the major one.

HIGH Tc SUPERCONDUCTIVITY: A MODEL BASED ON ANTIFERROMAGNETIC FLUCTUATIONS

1987 ◽  
Vol 01 (03n04) ◽  
pp. 1089-1096
Author(s):  
D. Schmeltzer
Keyword(s):  
Free Energy ◽  
High Temperature ◽  
Low Temperature ◽  
Fermi Liquid ◽  
Antiferromagnetic Interaction ◽  
Two Dimensional ◽  
Fractional Statistics ◽  
Bose Statistic ◽  
High Tc ◽  
High Tc Superconductivity

The system X–La–Cu–O is described as a Fermi liquid with antiferromagnetic interaction. This interaction gives rise to two types of fluctuations, magnetic and superconducting. As a result, we find a free energy which contains two order parameters which at high temperature give rise to superconductivity and at low temperature to reentry-like paramagnetism. For two-dimensional systems, topological effects give rise to fractional statistics and as a result superconductivity appears when the topological angle θ gives rise to a Bose statistic.

scholarly journals Ammonia-Rich High-Temperature Superconducting Intercalates of Iron Selenide Revealed through Time-Resolved in Situ X-ray and Neutron Diffraction

2014 ◽  
Vol 136 (2) ◽  
pp. 630-633 ◽  
Author(s):  
Stefan J. Sedlmaier ◽  
Simon J. Cassidy ◽  
Richard G. Morris ◽  
Michael Drakopoulos ◽  
Christina Reinhard ◽  
...  
Keyword(s):  
High Temperature ◽  
Neutron Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Iron Selenide ◽  
High Temperature Superconducting

Synthesis of a Bi2Sr2CaCu2Oy high-temperature superconducting phase with T c ° above 100 K

1997 ◽  
Vol 23 (6) ◽  
pp. 422-424
Author(s):  
Zh. M. Tomilo ◽  
N. A. Prytkova ◽  
E. M. Gololobov ◽  
D. M. Turtsevich
Keyword(s):  
High Temperature ◽  
Superconducting Phase ◽  
High Temperature Superconducting
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