Tl-based superconductors for high-current, high-field applications

Jergel, M.; Conde-Gallardo, A.; Falcony, C.; Štrbı́k, V.

doi:10.1088/0953-2048/9/6/001

Cited by 60 publications

(22 citation statements)

References 75 publications

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“…The partial substitution of Tl +3 ions by different cations would give different electronic configurations at the substituted sites and may provide interesting information about the superconducting of the final compound. On the other hand, the carrier density in the conducting CuO 2 planes and magnetic coupling between these planes depend upon the composition and thickness of the charge reservoir layer [6,7]. It was reported [8] that partial replacement of magnetic Er +3 ions by Tl +3 completely quenched the superconductivity near x= 0.28 in the Tl 1−x Er x Ba 2 Ca 2 Cu 3 O 9−δ system.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Excess Conductivity Analyses of Ce-Doped Tl1−x Ce x Ba2Ca2Cu3O10−δ Superconductors

Khan

Ghafoor

Abbas

2014

J Supercond Nov Magn

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The role of mobile carriers density supplied by TlBa 2 O 4−δ charge reservoir layer is investigated by doping Ce in TlBa 2 Ca 2 Cu 3 O 10−δ superconductors. The T c (onset) and T c (R = 0) versus Ce contents have shown almost a parabolic-shaped phase diagram which is interpreted in terms of hole's doping. The magnetic measurements showed that magnitude of diamagnetism is gradually suppressed with Ce doping at Tl site. Fourier transform infrared (FTIR) revealed that the phonon modes associated with apical oxygen atoms type Cu(2)-O A -Tl are softened, whereas the planar oxygen modes are hardened with the doping of Ce the unit cell. In the excess conductivity, analyses of conductivity data of Tl 1−x Ce x Ba 2 Ca 2 Cu 3 O 10−δ samples have shown a suppression of T cmf (K) and the width of 2D conductivity regimes, whereas the coherence length along the c-axis ξ c(0) and the interlayer coupling J are enhanced with the doping of Ce +4 in the charge reservoir. The increase in ξ c(0) is interpreted in the form of homogenization of the carrier's density of carriers the CuO 2 planes. The process of homogenization is accomplished with the reduction of density of carriers in the outer CuO 2 that consequently promotes increase in the phase relaxation time, τ φ , of the carriers, their Fermi velocity, and the energy required to break apart the Cooper pairs.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Excess Conductivity Analyses of Ce-Doped Tl1−x Ce x Ba2Ca2Cu3O10−δ Superconductors

Khan

Ghafoor

Abbas

2014

J Supercond Nov Magn

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“…Some of the applications of sol-gel process include production of protective coatings, porous films, optical coatings [1][2][3], electronic coatings [4,5], and high temperature superconductors [6][7][8]. By combining sol-gel chemistry with crosslinking reaction involving organosilane coupling agents, hybrid nanoscale coatings containing self-assembled nanoparticles can be developed and used for protection of metals against corrosion.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structure of Environmentally Friendly Hybrid Clay/Organosilane Nanocomposite Coatings

Iroh

Rajamani

2012

J Inorg Organomet Polym

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Environmentally friendly polysiloxane and clay/polysiloxane composite coatings were synthesized on aerospace-grade aluminum alloy AA2024-T3 substrates from mildly acidified aqueous solution. The polysiloxane coatings were synthesized by acid-catalyzed hydrolysis and condensation of organosilane coupling agents such as glycidoxypropyltrimethoxysilane (GPTMS) and tetramethoxysilane (TMOS) followed by solution drop-casting onto the substrate to form self assembled nanoparticles, coating. The epoxy polysiloxane coating formed by condensation reaction of hydrolyzed TMOS and GPTMS was subsequently cured with aminosilane coupling agent to form cross-linked polysiloxane coating. Clay/polysiloxane coating was formed by dispersing about 0.1-0.3wt% of clay in the hydrolyzed TMOS/GPTMS solution followed by solution casting and the resulting clay/polysiloxane composite coating was subsequently cured with aminosilane coupling agent. The structure and composition of organosilane coupling agents and hybrid polysiloxane coatings were determined by reflection-absorption infrared spectroscopy (RAIR) and X-ray diffraction spectrometry (XRD). The hydrolysis, condensation and curing reactions of TMOS and the organosilane coupling agents were studied by analyzing thin films cast on aluminum alloy substrate after a predetermined reaction time by using RAIR. The XRD results show that the resulting polysiloxanes are semi-crystalline polymers. Wide angle XRD analysis indicated that clay dispersed in clay/polysiloxane composite coating is either highly intercalated or partially exfoliated. This inference was drawn from the disappearance of d 001 diffraction peak for clay from the XRD spectrum of clay/polysiloxane coatings cured at 100°C for 2.5 h.

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“…Possible candidates for this application that show a T c value above 100 K are Tl 2 Ba 2 Ca 2 Cu 3 O 10 (Tl-2223) and Tl 2 Ba 2 CaCu 2 O 8 (Tl-2212) [1], where a supposed working temperature of 77 K (sufficiently below T c ) seems to be suitable for the integration of passive superconducting elements with active semiconducting elements.…”

Section: Introductionmentioning

confidence: 99%

Influence of the reaction conditions on the formation of Tl(Re)-Ba-Ca-Cu-O superconducting thin films by thallination in open system

Dujavová¹,

Valeriánová²,

Štrbı́k³

et al. 2007

Open Physics

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Rhenium avoids air degradation of the target as well as of precursor thin films during the preparation of high temperature Tl-based superconductors. Addition of Re has been used during synthesis of oriented Tl(Re)-Ba-Ca-Cu-O films. High temperature superconducting Tlbased thin films were prepared by a two step method combining RF magnetron sputtering and ex-situ thallination. Precursors with a composition of Re 0.1 Ba 2 Ca 2 Cu 3 O x were deposited on a CeO 2 buffered R-plane sapphire substrate. The sputtered films were prepared at room temperature in an Ar atmosphere. The thallination of the precursor films was performed in a one zone configuration, where both the pellet and precursor film were kept at the same temperature. The thallination temperature varied in the range of 850 -880• C and samples were held for 30, 45 and 60 min at this temperature in a flowing oxygen atmosphere. Besides Tl-2212, X-ray diffraction reveals the possibility of also preparing the Tl-2223 phase, which was until now not reported in a Re doped form.

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Tl-based superconductors for high-current, high-field applications

Cited by 60 publications

References 75 publications

Synthesis and Excess Conductivity Analyses of Ce-Doped Tl1−x Ce x Ba2Ca2Cu3O10−δ Superconductors

Synthesis and Excess Conductivity Analyses of Ce-Doped Tl1−x Ce x Ba2Ca2Cu3O10−δ Superconductors

Synthesis and Structure of Environmentally Friendly Hybrid Clay/Organosilane Nanocomposite Coatings

Influence of the reaction conditions on the formation of Tl(Re)-Ba-Ca-Cu-O superconducting thin films by thallination in open system

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