Electron microscopic study of partial dislocations in textured Y-Ba-Cu-O superconductors

Zheng, Jian‐Guo; Qi, Li; Ding, Feng; Ding, Shan; Yu, Shi‐dong; Shen, Guangjun; Liu, Feng‐sheng; Zhou, Lian; Mou, H.L.

doi:10.1063/1.352117

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…Stacking faults (SFs) constitute a prominent defect in melttextured 123 materials, which have been the subject of intense debate regarding both their generation mechanism and implications on superconducting properties [8,[54][55][56][57][58][59][60]. The most widely observed SF in 123 materials consists of a double CuO x chain layer [61] causing a local depression of the superconducting order parameter.…”

Section: Stacking Faultsmentioning

confidence: 99%

Tailoring of microstructure and critical currents in directionally solidified

Sandiumenge

Martı́nez

Obradors

1997

Supercond. Sci. Technol.

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Directionally solidified composites display a complex microstructure with several defects coexisting in the matrix and hence the identification of the flux-pinning mechanisms requires a detailed analysis of the critical currents. In this work we review the formation mechanism of twins, stacking faults, microcracks, subgrain boundaries and dislocations in connection with the refining strategies of (211 phase) inclusions and modifications of the microstructure generated through prolonged oxygen annealings and high-temperature plastic deformation of the ceramic. The influence of these defects and post-processing treatments on the critical currents is then analysed focusing on their relative importance as flux-pinning centres at different temperatures and magnetic fields up to 20 T. A complete magnetic phase diagram is finally proposed as a basis for a systematic classification of the observed irreversible superconducting behaviour in single-grain melt-textured composites.

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Section: Stacking Faultsmentioning

confidence: 99%

Tailoring of microstructure and critical currents in directionally solidified

Sandiumenge

Martı́nez

Obradors

1997

Supercond. Sci. Technol.

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“…The mimetic gravity with the coupling (✷φ)R has been proposed in Ref. [29]. In scalar-tensor theory, it is interesting to explore the possibility of such higher order derivative couplings.…”

Section: Introductionmentioning

confidence: 99%

Higher order derivative coupling to gravity and its cosmological implications

Cai

Piao

2017

Phys. Rev. D

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We show that the R (3) δK operator in effective field theory is significant for avoiding the instability of nonsingular bounce, where R (3) and K µν are the three-dimensional Ricci scalar and the extrinsic curvature on the spacelike hypersurface, respectively. We point out that the covariant Lagrangian of R (3) δK, i.e., L R (3) δK , has the second order derivative couplings of scalar field to gravity which do not appear in Horndeski theory or its extensions, but does not bring the Ostrogradski ghost.We also discuss the possible effect of L R (3) δK on the primordial scalar perturbation in inflation scenario.

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