Cu0.5Tl0.5Ba2Ca3Cu4−y
Zn
y
O12−δ
(y=0, 1.0, 2.0, 3.0, 3.5): Superconductor with Four ZnO2 Planes |
| |
Authors: | Nawazish A Khan M Mumtaz |
| |
Affiliation: | (1) Materials Science Laboratory, Department of Physics, Quaid-i-Azam University, 45320 Islamabad, Pakistan |
| |
Abstract: | A new Cu0.5Tl0.5Ba2Ca3Cu4−y
Zn
y
O12−δ
(y=0, 1.0, 2.0, 3.0, 3.5) superconductor with four ZnO2 planes is reported. The structure of the material remains tetragonal for all Zn doping concentration. The substitution of
Zn at CuO2 planar site was carried out following Cu0.5Tl0.5Ba2Ca3Cu4−y
Zn
y
O12−δ
(y=0, 1.0, 2.0, 3.0, 3.5) formula. Contrary to all previous studies of Zn doping in all copper oxide high temperature superconductors,
the zero resistivity critical temperature T
c(R=0), critical current density and quantity of diamagnetism increase with increased Zn concentration. The onset temperature
of superconductivity in these samples was observed at 128 K and T
c(R=0) at 122 K for y=3.5. The volume of the unit cell observed through X-ray diffraction scan is found to decrease with increase Zn doping; promoting
an increase in Fermi vector K
F and effective density of states which results in enhanced superconductivity parameters. The synthesis of Cu0.5Tl0.5Ba2Ca3Cu4−y
Zn
y
O12−δ
material by this method is highly reproducible.
|
| |
Keywords: | Cu0 5Tl0 5Ba2Ca3Cu4− y Zn y O12− δ superconductors Zn doping Higher T c(R=0) Higher J c(H=0) |
本文献已被 SpringerLink 等数据库收录! |
|