Journal ArticleDOI
Magnetic ion doped Cu1- xTlxBa2Ca2- yMgyCu1.5Ni1.5O10- δ (y = 0, 0.5, 1.0, 1.5) superconductors and their improved inter-plane coupling
Nawazish A. Khan,Najmul Hassan +1 more
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TLDR
In this paper, the effect of Mg substitution on the inter-plane coupling of superconductors has been investigated and it has been shown that a higher Mg doping concentration enhances the interplane coupling which possibly promotes the de-localization of the carriers to the Ni 2+ sites.Abstract:
We have synthesized Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3− y Ni y O 10− δ ( y = 0, 0.5, 1.0, 1.5) superconductors at normal pressure and studied the enhanced correlation among CuO 2 /NiO 2 planes of Cu 0.5 Tl 0.5 Ba 2 Ca 2− y Mg y Cu 1.5 Ni 1.5 O 10− δ ( y = 0.5, 1.0, 1.5) superconductors by doping Mg at the Ca sites. Surprisingly, we have not observed any substantial depression of critical temperature with Ni doping in Cu 0.5 Tl 0.5 Ba 2 Ca 2 Cu 3− y Ni y O 10− δ ( y = 0, 0.5, 1.0, 1.5) superconductors. The main objective of Mg substitution is to enhance the inter-plane coupling which may increase the interactions of the spins of Ni atoms in different planes. The increased inter-plane coupling may enhance interactions of the atomic spins with the free carriers and might be a key to understanding the effects of spin scattering and their role in the mechanism of high temperature superconductivity. We have observed a decrease of c -axis length with increased Mg concentration in Cu 0.5 Tl 0.5 Ba 2 Ca 2− y Mg y Cu 1.5 Ni 1.5 O 10− δ ( y = 0.5, 1.0, 1.5) superconductors, showing an enhanced inter-plane coupling. The room temperature resistivity of the samples is decreased and the zero resistivity critical temperature [ T c ( R = 0)] and the magnitude of diamagnetism are increased with higher Mg doping in Cu 0.5 Tl 0.5 Ba 2 Ca 2− y Mg y Cu 1.5 Ni 1.5 O 10− δ superconductors. A maximum diamagnetism is observed in the samples when Mg atoms replace 75% of the Ca atoms, which shows that a higher Mg doping concentration enhances the inter-plane coupling which possibly promotes the de-localization of the carriers to the Ni 2+ sites and results in enhanced superconducting properties.read more
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Structure and superconducting properties of Fe-doped Cu0.5Tl0.5Ba2Ca2Cu3-yFeyO10-δ(y=0, 0.02, 0.03, 0.05, 0.075) superconductor
Najmul Hassan,Nawazish A. Khan +1 more
TL;DR: In this article, the effects of Fe-doping on superconductivity and structure of Cu 0.5 Tl 0.1223 superconductors are investigated by means of resistivity, AC-susceptibility measurements, X-ray diffraction (XRD) and thermogravimetric analysis.
Journal ArticleDOI
Excess-conductivity analysis of Mg- and Be-doped polycrystalline Cu0.5Tl0.5Ba2Ca1.5M1.5Cu4O12−δ (M=0, Be, Mg) superconductors
TL;DR: In this article, high-resolution electrical resistivity ρ(T) data of as-prepared and O2-annealed Cu0.5Tl 0.5Ba2Ca1.5M1.
Journal ArticleDOI
Dielectric response of Cu0.5Tl0.5Ba2(Ca2−yMgy)(Cu0.5Zn2.5)O10−δ bulk superconductor to frequency and temperature
M. Mumtaz,Nawazish A. Khan +1 more
TL;DR: In this paper, the dielectric properties of Cu 0.5, 1.0 and 1.5 superconductor samples were studied at 79 and 290 K by means of capacitance and conductance measurements with the test frequency ( f ) in the range of 10 KHz to 10 KMHz.
Journal ArticleDOI
Enhancement the formation of (Cu, Tl)-1223 superconducting phase by Cd-substitution
TL;DR: In this paper, the effect of Cd-substitution on the formation and the transport properties of the (Cu, Tl)-1223 phase was investigated by a single-step solid-state reaction technique.
Journal ArticleDOI
Determination of Stoichiometry and Superconducting Properties of Tl-1234 and (Cu0.25Tl0.75)-1234 Phases Substituted by Erbium
TL;DR: In this paper, a single step solid-state reaction technique at normal pressure using high-purity oxide elements has been used to obtain superconducting samples of type TlBa2Ca3−yEryCu4O11−δ and Cu0.25Tl0.1.
References
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