Materials chemistry and thermodynamics of REBa2Cu3O7−x

MacManus‐Driscoll, Judith L.

doi:10.1002/adma.19970090602

Cited by 73 publications

(42 citation statements)

References 181 publications

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“…Interestingly for both YBCO:Ag10 and Ag20 samples the second peak (T P2 ) is not visible even under applied fields of as high as up to 13Tesla, see figures 3(a) and (b). It seems as if the YBCO:Ag composite sample are like single domain and the inter grain transition is not visible [13,14]. It seems that the granular peak is disappeared on addition of Ag in YBCO.…”

Section: Resultsmentioning

confidence: 99%

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%

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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“…Some of the groups reported the a-c-a-axis transition with decreasing growth temperature for both the temperature regions, above the peritectic temperature (T p ) and below T p , that is inconsistent with occurrence of the a-caxis transition in a lower temperature range, below T p , reported by the others. A possible reason for the discrepancy should be related with the use of Y-ZrO 2 (YSZ) crucible, which would react with solvent and then form the sand-like BaZrO 3 (BZO) grains [15][16][17]. The formation of BZO eventually led to high solution viscosity and low solute diffusion, which is equivalent to a low supersaturation.…”

Section: Introductionmentioning

confidence: 99%

Growth condition related orientation transition for YBa2Cu3O7−δ films on NdGaO3 substrate

Chen

Guo

Cai

et al. 2012

Journal of Crystal Growth

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“…More recently, second-generation high-T c superconductor (HTS) tapes (also called HTS coated conductors) deposited on flexible coatedconductors have received much attention [7][8][9][10][11]. Secondgeneration superconductors are based on Ba 2 YCu 3 O 6+z and Ba 2 RCu 3 O 6+z materials (R = lanthanide-substituted variants) [12][13][14][15]. The Ba 2 YCu 3 O 6+z and Ba 2 RCu 3 O 6+z materials are relatively more isotropic when compared with BSCCO-based superconductors, and can retain current-carrying ability at liquid nitrogen temperature under high magnetic fields.…”

Section: Introductionmentioning

confidence: 99%