Influence of experimental conditions on the electric field effect in the ceramic (BiPb)2Sr2Ca2Cu3Ox

Смирнов, Б. И.; Orlova, T. S.; Kudymov, A. V.; Lanagan, Michael T.; Chen, N.; Goretta, K. C.

doi:10.1134/1.1130166

Cited by 3 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen that for samples of type II, in which the field effect is absent, the fall of I c with magnetic field at low magnetic fields is much more pronounced than in the samples of type I which exhibit the field effect. A similar strong influence of the magnetic field on I c was observed in Agdoped [8] and hydrogen-treated YBa 2 Cu 3 O y ceramics [10]. For these ceramics, the field effect was also absent [8,10].…”

Section: Resultssupporting

confidence: 69%

“…A similar strong influence of the magnetic field on I c was observed in Agdoped [8] and hydrogen-treated YBa 2 Cu 3 O y ceramics [10]. For these ceramics, the field effect was also absent [8,10].…”

Section: Resultssupporting

confidence: 69%

“…However, the field effect may also occur in thick films and also in HTSC ceramics [4]. For example, in an electrode-insulator-superconductor system, a reversible effect of external electric field on the critical current I c and current-voltage characteristics (I −V ) was observed in high-T c YBCO ceramics [5][6][7][8][9][10]. In this case, the field effect was observed only when the sample was in the superconducting state.…”

Section: Introductionmentioning

confidence: 99%

“…Further investigations showed that the occurrence of the field effect and its value substantially depend on the composition and technology of preparation of a ceramic. In particular, the field effect in YBCO ceramics disappeared as a result of doping with Ag [8] or treatment by hydrogen [10]. It has been suggested that the field effect is primarily associated with the possible influence of the field on the weak links at grain boundaries [6], but nevertheless its physical nature in the ceramics remains unclear.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Correlation of the electric field effect with the weak link behaviour in granular YBCO superconductors

Orlova

Смирнов

Laval

et al. 1999

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The effect of an electric field E = 120 MV m-1 on the critical current Ic and the current-voltage characteristics of yttrium-based high-Tc ceramics have been studied experimentally with data on the electric field effect related to the critical current behaviour with temperature near the critical temperature Tc. The objects of study were ceramics with stoichiometric composition YBa2Cu3Oy, fabricated in different sintering conditions (123-I and 123-II samples), copper-deficient YBa2Cu3-xOy (D samples) and YBa2Cu3-xOy/Agx ceramics (S samples with silver present in amount equal to the copper deficiency 0Ic, whereas in S and 123-II samples no field effect is observed. The results of the measurements of the temperature dependence of Ic near the critical temperature confirmed the presence of superconductor-insulator-superconductor tunnel intergrain junctions (SIS) in D and 123-I samples, and superconductor-normal metal-superconductor proximity junctions (SNS) in S and 123-II samples. The conclusion is drawn that the electric-field effect correlates with the existence of SIS-type weak links at grain boundaries in the ceramic.

show abstract

Section: Resultssupporting

confidence: 69%

Section: Resultssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Correlation of the electric field effect with the weak link behaviour in granular YBCO superconductors

Orlova

Смирнов

Laval

et al. 1999

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…However, in this model there is either an enhancement or a deleption of J c depending on the sign of E. Authors of Ref. [304] have proposed that an electric field applied to a granular superconductor can produce a magnetoelectriclike effect, which could be indirectly related to the behavior of the critical current observed in [296][297][298][299][305][306][307], but no comparison with the experiments was given. Simulation.…”

Section: Fig 47 I-v Characteristics For (Bipb)22sr2ca2cu3oxmentioning

confidence: 99%

Paramagnetic Meissner effect and related dynamical phenomena

2003

Physics Reports

View full text Add to dashboard Cite

The hallmark of superconductivity is the diamagnetic response to external magnetic field. In striking contrast to this behavior, a paramagnetic response or paramagnetic Meissner effect was observed in ceramic high-Tc and in conventional superconductors. The present review is given on this interesting effect and related phenomena. We begin with a detailed discussion of experimental results on the paramagnetic Meissner effect in both granular and conventional superconductors. There are two main mechanisms leading to the paramagnetic response: the so called d-wave and the flux compression. In the first scenario, the Josephson critical current between two d-wave superconductors becomes negative or equivalently one has a π junction. The paramagnetic signal occurs due to the nonzero spontaneous supercurrent circulating in a loop consisting of odd number of π junctions. In addition to the d-wave mechanism we present the flux compression mechanism for the paramagnetic Meissner effect. The compression may be due to either an inhomogeneous superconducting transition or flux trap inside the giant vortex state. The flux trapping which acts like a total nonzero spontaneous magnetic moment causes the paramagnetic signal. The anisotropic pairing scenario is believed to be valid for granular materials while the flux trap one can be applied to both conventional and high-Tc superconductors. The study of different phenomena by a three-dimensional lattice model of randomly distributed π Josephson junctions with finite self-inductance occupies the main part of our review. By simulations one can show that the chiral glass phase in which chiralities are frozen in time and in space may occur in granular superconductors possessing d-wave pairing symmetry. Experimental attempts on the search for the chiral glass phase are analysed. Experiments on dynamical phenomena such as AC susceptibility, compensation effect, anomalous microwave absorption, aging effect, AC resistivity and enhancement of critical current by external electric fields are considered. These phenomena were studied by Monte Carlo and Langevin dynamics simulations which show satisfactory agreement with experiments. We present a resistively shunted junction model describing rich dynamics of Josephson junction networks.

show abstract

Critical Current Enhancement Due to an Electric Field in a Granulard-Wave Superconductor

1999

View full text Add to dashboard Cite

We study the effects of an electric field in the transport properties of bulk granular superconductors with different kinds of disorder. We find that for a d-wave granular superconductor with random p junctions the critical current always increases after applying a strong electric field, regardless of the polarity of the field. This result plus a change in the voltage as a function of the electric field are in good agreement with experimental results in ceramic high T c superconductors.

show abstract

Influence of experimental conditions on the electric field effect in the ceramic (BiPb)2Sr2Ca2Cu3Ox

Cited by 3 publications

References 6 publications

Correlation of the electric field effect with the weak link behaviour in granular YBCO superconductors

Correlation of the electric field effect with the weak link behaviour in granular YBCO superconductors

Paramagnetic Meissner effect and related dynamical phenomena

Critical Current Enhancement Due to an Electric Field in a Granulard-Wave Superconductor

Contact Info

Product

Resources

About