Superconductivity in Co doped Cu0.5Tl0.5Ba2(CaM)Cu2.95Co0.05O10−δ (M=Mg, Be) samples

Khurram, A. A.; Ullah, Anayat; Khan, Nawazish A.

doi:10.1016/j.jallcom.2009.03.127

Cited by 8 publications

(4 citation statements)

References 46 publications

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“…Substitution of magnetic ions such as Fe, Co, or Ni has been suggested to suppress AFM Cu spins in CuO 2 planes of several cuprates [56][57][58]. Interestingly, previous study on the substitution of ferromagnetic Ni ion at Cu-site in Cu 1−x Tl x Ba 2 Ca 2 Cu 3−y Ni y O 10−δ [58] showed T c zero remained above 90 K for all Ni concentrations which was suggested to be due to the AFM suppression resulting in a more homogeneous distribution of charge carriers.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ce Substitution at Sr-Site on Superconducting Fluctuation Behavior and Infrared Absorption of Tl0.9Bi0.1Sr2−x Ce x Ca0.9Y0.1Cu1.99Fe0.01O7−δ (x=0–0.20) Ceramics

Ismail

Yahya

Khan

2012

J Supercond Nov Magn

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Ce substituted 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) samples were synthesized to determine the effects of the higher valence ion substitution on superconductivity and structure of the Fe-doped Tl1212 derivatives. The normal state behavior for x = 0 showed semiconductor-like behavior which gradually turned to metallic behavior with increasing Ce at x = 0.05-0.15. However, further substitution of Ce for x > 0.15 turned the normal state to insulating behavior. The zero critical temperature, T c zero increased from 65.4 K (x = 0.05) to 71.0 K (x = 0.10), but slightly decreased for x > 0.10 indicating the optimum value of average copper valence was achieved at x = 0.10. Excess conductivity analysis using the Aslamazov Larkin, AL and Lawrence-Doniach, LD models revealed two-dimensional, 2D to three-dimensional, 3D transition of superconducting fluctuation behavior, SFB with the highest transition temperature, T 2D-3D at x = 0.10. FTIR analysis in conjunction with XRD results showed softening of FeO 2 /CuO 2 planar oxygen mode from 610.5 cm −1 (x = 0) to 605 cm −1 (x = 0.20) which is suggested to be related to possible increase of inter plane coupling, J and this is supported by computed results based on the LD model. The enhanced J increases superconducting coherence length along c-axis, ξ c (0), and hence lowers anisotropy, γ resulting in enhanced superconducting properties.

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Section: Introductionmentioning

confidence: 99%

Influence of Ce Substitution at Sr-Site on Superconducting Fluctuation Behavior and Infrared Absorption of Tl0.9Bi0.1Sr2−x Ce x Ca0.9Y0.1Cu1.99Fe0.01O7−δ (x=0–0.20) Ceramics

Ismail

Yahya

Khan

2012

J Supercond Nov Magn

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“…The superconductivity at T c = 11.3 K for non-superconducting cerium oxypnictides (CeFeAsO) has been recently observed by doping a magnetic ion (Co) in the FeAs layers [17]. This indicated a major difference from cuprate superconductors, where any substitution in the conducting CuO 2 planes by other metal ions always destroys superconductivity or lowers the transition temperature [18,19]. Therefore, it is of great interest to explore the effects of Co doping on CeFeAsO.…”

Section: Introductionmentioning

confidence: 99%

Effects of Co doping on the transport properties and superconductivity in CeFe_{1 −x}Co_xAsO

Zhao

Bérardan

et al. 2010

J. Phys.: Condens. Matter

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A series of CeFe(1-x)Co(x)AsO oxyarsenide compounds with Co doping on iron sites (x = 0-0.2) have been synthesized by a solid state reaction method. The effects of Co doping on the electrical transport properties and superconductivity were analyzed with a special emphasis on the analysis of thermopower. Undoped CeFeAsO shows an electrical resistivity anomaly at about 150 K, which was ascribed to a spin-density-wave (SDW) instability. This anomaly is suppressed and a superconducting transition occurs at T(c) = 3.2 K in CeFe(0.95)Co(0.05)AsO, the maximum superconducting transition temperature (T(c)) of 12.5 K is observed in CeFe(0.90)Co(0.10)AsO, and the thermopower is increased by the Co doping. As has been previously suggested, the emergence of superconductivity seems to be closely linked to the thermopower, and there is a close correlation between T(c) and the thermopower, both showing a similar dome-like doping dependence.

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“…Yahya). CuO 2 planes and Cu 1−x Tl x charge reservoir layers in high temperature superconductivity [13][14][15]2,16]. An equally interesting family is the thallium-based family with the general formula TlBa 2 Ca n−1 Cu n O 2n+3 [17].…”

Section: Introductionmentioning

confidence: 99%

Superconducting fluctuation behavior and infrared absorption properties of Tl1−Cu Sr1.6Yb0.4CaCu2O7 and Tl0.5Pb0.5Sr2−Mg Ca0.8Yb0.2Cu2O7− ceramics

Ahmad¹,

Khan²,

Yahya³

2010

Journal of Alloys and Compounds

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Superconductivity in Co doped Cu0.5Tl0.5Ba2(CaM)Cu2.95Co0.05O10−δ (M=Mg, Be) samples

Cited by 8 publications

References 46 publications

Influence of Ce Substitution at Sr-Site on Superconducting Fluctuation Behavior and Infrared Absorption of Tl0.9Bi0.1Sr2−x Ce x Ca0.9Y0.1Cu1.99Fe0.01O7−δ (x=0–0.20) Ceramics

Influence of Ce Substitution at Sr-Site on Superconducting Fluctuation Behavior and Infrared Absorption of Tl0.9Bi0.1Sr2−x Ce x Ca0.9Y0.1Cu1.99Fe0.01O7−δ (x=0–0.20) Ceramics

Effects of Co doping on the transport properties and superconductivity in CeFe_{1 −x}Co_xAsO

Superconducting fluctuation behavior and infrared absorption properties of Tl1−Cu Sr1.6Yb0.4CaCu2O7 and Tl0.5Pb0.5Sr2−Mg Ca0.8Yb0.2Cu2O7− ceramics

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Superconductivity in Co doped Cu0.5Tl0.5Ba2(CaM)Cu2.95Co0.05O10−δ (M=Mg, Be) samples

Cited by 8 publications

References 46 publications

Influence of Ce Substitution at Sr-Site on Superconducting Fluctuation Behavior and Infrared Absorption of Tl0.9Bi0.1Sr2−x Ce x Ca0.9Y0.1Cu1.99Fe0.01O7−δ (x=0–0.20) Ceramics

Influence of Ce Substitution at Sr-Site on Superconducting Fluctuation Behavior and Infrared Absorption of Tl0.9Bi0.1Sr2−x Ce x Ca0.9Y0.1Cu1.99Fe0.01O7−δ (x=0–0.20) Ceramics

Effects of Co doping on the transport properties and superconductivity in CeFe1 −xCoxAsO

Superconducting fluctuation behavior and infrared absorption properties of Tl1−Cu Sr1.6Yb0.4CaCu2O7 and Tl0.5Pb0.5Sr2−Mg Ca0.8Yb0.2Cu2O7− ceramics

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Effects of Co doping on the transport properties and superconductivity in CeFe_{1 −x}Co_xAsO