Journal ArticleDOI
Suppression of anti-ferromagnetism by enhanced solubility of Ni in Cu1−xTlxBa2Ca2Cu3−yNiyO10−δ (y = 0, 0.5, 1.0, 1.5) superconductor
Nawazish A. Khan,Najmul Hassan +1 more
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In this article, the authors have shown that the doping of 50% ferromagnetic Ni at Cu sites in the inner CuO 2 planes does not destroy the superconductivity; most likely reasons for the enhanced solubility have also been discussed.About:
This article is published in Materials Chemistry and Physics.The article was published on 2007-10-15. It has received 16 citations till now. The article focuses on the topics: Superconductivity.read more
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Fluctuation-induced conductivity of polycrystalline Ni doped Cu0.5Tl0.5Ba2Ca2Cu3−yNiyO10−δ (y=0, 0.5, 1.0, 1.5) superconductors
Najmul Hassan,Nawazish A. Khan +1 more
TL;DR: In this paper, the dimensionality of fluctuations above the mean field critical temperature was investigated for Ni free and Ni doped Cu05Tl05Ba2Ca2Cu2Cu3−yNiyO10−δ (y=0, 05, 10, 15, 15) samples.
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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.
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Suppression of Tc in Co-doped (Cu0.5Tl0.5)Ba2Ca2Cu3−xCoxO10−δ superconductor
Nawazish A. Khan,Muhammad Waseem Mumtaz,Muhammad Waseem Mumtaz,Anayat Ullah,Najmul Hassan,A.A. Khurram +5 more
TL;DR: In this article, the authors showed that the increased free carrier density in the CuO2 planes enhances the superconducting properties of the final compound, since alkali metals are known to lose their outermost s-orbital electron easily.
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Effect of Mg doping in enhancing superconductivity in Ni doped (Cu0.5Tl0.25Li0.25)Ba2Ca2−yMgy (Cu1.5Ni1.5)O10−δ (y = 0, 0.5, 1.0, 1.5) superconductors
Nawazish A. Khan,Najmul Hassan +1 more
TL;DR: In this paper, the effect of enhanced interactions between the Ni +2 ions and the mobile carriers in the planes of superconductors has been investigated and it has been shown that the critical temperature and magnitude of diamagnetism are further enhanced by Li doping in the charge reservoir layer.
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Influence of Ce Substitution at Sr-Site on Superconducting Fluctuation Behavior and Infrared Absorption of Tl 0.9 Bi 0.1 Sr 2−x Ce x Ca 0.9 Y 0.1 Cu 1.99 Fe 0.01 O 7−δ ( x =0–0.20) Ceramics
TL;DR: In this article, the effects of higher valence ion substitution on superconductivity and structure of the Fe-doped Tl1212 derivatives were synthesized to determine the effects.
References
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Magnetic pair-breaking effects: Moment formation and critical doping level in superconducting La 1.85 Sr 0.15 Cu 1 − x A x O 4 systems ( A =Fe,Co,Ni,Zn,Ga,Al)
TL;DR: Relations entre T c et le niveau de dopage de ces supraconducteurs ainsi qu'avec les niveaux de dopages critique arec un moment magnetique intrinseque net sur le plan Cu−O 2.
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Effect of carrier distribution on superconducting characteristics of the multilayered high- T c cuprate ( Cu 0.6 C 0.4 ) Ba 2 Ca 3 Cu 4 O 1 2 + y : 63 Cu − NMR study
TL;DR: In this article, the authors reported Cu-NMR studies of the multilayered high-${T}$ cuprate of Cu1234 with the inner planes (IP) and outer planes (OP) being heavily overdoped.
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Effect of magnetic and nonmagnetic impurities (Ni, Zn) substitution for Cu in Bi 2 (SrCa) 2+n (Cu 1-x M x ) 1+n O y whiskers
TL;DR: In this paper, the authors measured the change in resistive resistivity of the resistive whiskers due to substitution of Ni (magnetic) or Zn (nonmagnetic), for Cu.
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Tl valence change and T c enhancement ( > 130 K ) in ( C u , T l ) Ba 2 Ca 2 Cu 3 O y due to nitrogen annealing
Keiji Tanaka,A. Iyo,Norio Terada,Kazuyasu Tokiwa,Seiji Miyashita,Yasumoto Tanaka,Takeyo Tsukamoto,S.K. Agarwal,T. Watanabe,Hideo Ihara +9 more
TL;DR: In this article, Annealing effects in a reducing environment (flowing nitrogen) in the temperature range of $200--600\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ are reported on the high Tl content.
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Universal Hall effect in La1.85Sr0.15Cu1-xAxO4 systems (A=Fe,Co,Ni,Zn,Ga).
TL;DR: The temperature dependence of the Hall angle is shown to follow cotΘ H = αT 2 + C(x) in five differently doped La 1.85 Sr 0.15 Cu 1-x A x O 4 systems, regardless of the different magnetic or valence state of an impurity.