Temperature dependence of the resistivity in Au─YBa2Cu3Oxsintered composites

Lambert, Caroline; Debierre, Jean–Marc; Albinet, G.; Marfaing, J.

doi:10.1080/13642819908214858

Cited by 4 publications

(5 citation statements)

References 20 publications

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“…In zero applied field, the superconducting transition is single step with T c (ρ= 0) of 88K for pure YBCO. The broadening of transition with clear two step nature in small fields of 0.1Tesla is reminiscent of insulating grain boundaries between superconducting grains of pure YBCO [4][5][6]7]. One needs to overcome the insulating grain boundaries for high field practical applications of YBCO superconductor [4,7].…”

Section: Resultsmentioning

confidence: 99%

“…The broadening of transition with clear two step nature in small fields of 0.1Tesla is reminiscent of insulating grain boundaries between superconducting grains of pure YBCO [4][5][6]7]. One needs to overcome the insulating grain boundaries for high field practical applications of YBCO superconductor [4,7]. This question is haunting the scientific community from over two decades since the invention of high T c superconductivity of cuprates.…”

Section: Resultsmentioning

confidence: 99%

“…The researchers have tried to improve the granular coupling of YBCO by making composites of the superconductor with impurities like Ag, Au etc. [2][3][4][5]. Very recently, we reported that the Ag doping enhances the inter-granular couplings of YBCO through grain alignment, grain boundary doping and minimization of grain-boundary area [6].…”

Section: Introductionmentioning

confidence: 99%

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High field magneto-transport study of YBa2Cu3O7:Agx (x=0.00–0.20)

Rani

Pal

Awana

2014

Physica C: Superconductivity and its Applications

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We report high field (up to 13 Tesla) magneto transport [ρ(T)H] of YBa 2 Cu 3 O 7 (YBCO):Ag x (x= 0.0, 0.1 and 0.2) composites. The transport properties are significantly improved by Ag doping on the insulating grain boundaries of YBCO. Pure and Ag diffused YBCO superconducting samples are synthesised through solid state reaction route. Both pure and Ag doped YBCO are superconducting at below 90K. Though, the T c (ρ=0) of YBCO:Ag samples under applied field of 13 Tesla is around 65K, the same is 45K for pure YBCO under same applied field. The upper critical field [H c2 (0)], being estimated from ρ(T)H is around 70Tesla for pristine sample, and is above 190Tesla for Ag doped samples. The boarding of the resistive transition under applied magnetic field is comparatively less and nearly single step for Ag doped samples, while the same is clearly two step and relatively much larger for the pristine YBCO. The resistive broadening is explained on the basis of changed inter-granular coupling and thermally activated flux flow (TAFF). The TAFF activation energy (U 0 ) is found to be linear with applied magnetic field for all the samples, but with nearly an order of magnitude less value for the Ag doped samples. Summarily, it is shown that inclusion of Ag significantly improves the superconducting performance of YBCO:Ag composites, in particular under applied field. PACS Nos. 74.72. Gh, 74.25.fc, 74.25.Ha

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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High field magneto-transport study of YBa2Cu3O7:Agx (x=0.00–0.20)

Rani

Pal

Awana

2014

Physica C: Superconductivity and its Applications

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“…On the other hand, the complex vortex dynamics, poor flux pinning and weak intergrain links are major limiting factors. Substitutions like oxides [11][12][13], nanoparticles and carbon nanotubes (CNT) [14,15] and metals [16][17][18][19][20][21] in cuprates have enhanced their prospectus for promising applications. It is found that Y in Y-123 system could be replaced by almost all the rare earth (RE) (Gd, Ho, Nb etc) elements [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…It is found that Y in Y-123 system could be replaced by almost all the rare earth (RE) (Gd, Ho, Nb etc) elements [16][17][18]. Doping of Gd [16], Ho [17], Nb [18] and composites with NiO [11], graphene [14], Au [19], graphene oxide [22] have resulted in the enhancement of flux pinning. Also, substitution of nonmagnetic and magnetic elements such as Zn and Ni, for Cu site in Y-123, modify the flux pinning mechanisms in the compound then led to J c increasing.…”

Section: Introductionmentioning

confidence: 99%

The effect of Ni doping on the electrical and magnetic properties of Y_1-xNi_xBa₂Cu₃O_7−δ delta superconductors

Hadi-Sichani

Shakeripour

Salamati

2020

Mater. Res. Express

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The Y 1-x Ni x Ba 2 Cu 3 O 7-δ superconducting samples with low level of Ni concentration were prepared by the standard solid-state reaction. The AC susceptibility, magnetoresistivity, microstructure and the critical current density, J c , of samples as a function of temperature, magnetic field and Ni doping are investigated. The AC susceptibility measurements show that the displacement of the peak temperature T p of the imaginary part of the susceptibility χ″ versus magnetic field was reduced strongly by Ni doping up to an optimum level, which shows the increasing of flux pinning by Ni doping. The J c of samples was derived from AC susceptibility utilizing the Bean model. It shows an increasing in J c by Ni doping, at any temperature or magnetic field, consistent with the results of J c measurements. The magnetoresistance measurements were carried out under magnetic fields up to 1 T and explained by TAFC model. Utilizing this model, the vortex dynamic behaviour and the activation energy U (H) of the compound are investigated. We found that the U (H) increases and the resistive broadening is strongly reduced by Ni doping. The SEM measurements show that the grain sizes are clearly increased and the grain connections are improved by Ni doping. The results of all the observations taken from different measurements are consistent together and indicate the Ni doping has an effective role to improve the intergranular coupling and flux pinning.

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