A possible mechanism of superconductivity in high-Tc cuprates

Fu-Sui, Liu; Chen, Wan-Fang

doi:10.1016/s0921-4534(00)01512-4

Cited by 3 publications

(3 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Grain orientation is a desirable microstructural characteristic for HTCS since it benefits high I c values, reducing the "weak-link" problem 25 . In addition, the MEV/EDS technique endorsed the existence of some low content of the cuprate -(Sr,Ca) 14 Cu 24 O 41 (14:24-AEC) -as a secondary phase, Fig. 6.…”

Section: Resultsmentioning

confidence: 91%

“…This phase was originally reported as possessing a T c of 80 K 26 , but some evidence has appeared recently indicating that the real genuine critical temperature value of this phase is much higher and could be close to 100 K 14,15,27 . Besides proper choice of cationic relation between Bi, Sr e Ca, it is necessary to reach an optimal value of excess oxygen, ∆, in the Bi 2+x Sr 3-y Ca y Cu 2 O 8+∆ 28 , in order to achieve values of T c above 90 K. The optimal value of excess oxygen in this phase is indicated by an onset critical temperatures of about 95 K. In this study, it is reported T c,onset of about 97.5 K. In order to attain such a high value, it was necessary to reach the right balance of oxygen and nitrogen partial pressures during the whole thermal cycle, Fig.…”

Section: Discussionmentioning

confidence: 94%

“…The increase of the Bi-2212 T c 's will consequently reduce depinning of the magnetic flux lines due to thermal agitation. There are theoretical 14 and experimental 15 evidences that T c value of Bi-2212 could change over a large scale range. Namely, the Bi 2+x Sr 3-y Ca y Cu 2 O 8+∆ manifests a possibility to have controlled and increased charge-carrier density by tuning the oxygen non-stoichiometry (∆) and manipulating the cation composition 16 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of Bulk Bi2+xSr3-yCa yCu 2O8+delta Superconductors by Partial-Melting Route for Fault Current Limiters Application

Marinković

Xia²,

Saléh³

et al. 2002

Mat. Res.

View full text Add to dashboard Cite

The production of bulk Bi 2+x Sr 3-y Ca y Cu 2 O 8+∆ (Bi-2212) superconductors for fault current limiter application was developed via a partial-melting route. Aiming high I c (critical current), which is the essential superconducting characteristic for application of this material in the construction of Fault Current Limiters (FCL), the produced blocks have predominance of Bi-2212 phase (83 wt%), which characterizes with high values of zero and onset transport critical temperature of 92 K and 97.5 K, respectively. A relatively low transition width, ∆T, from the superconducting to the normal state of 5.5 K, revealed a good intergrain connectivity. Consequently, current measurements on the blocks of Bi-2212 show promising I c values of 230 A and 850 A for direct and alternate current, respectively. It is expected that further increases in the I c values will depend on the elimination of an observed amorphous phase and further reduction of amount and grain sizes of secondary phases, still present in the blocks obtained by the proposed partial-melting route. This may be achieved by a further optimization of the partial-melting processing parameters.

show abstract

Section: Resultsmentioning

confidence: 91%