Electric field effect in (BiPb)2Sr2Ca2Cu3Ox superconductor bars

Смирнов, Б. И.; Orlova, T. S.; Kudymov, A. V.; Lanagan, Michael T.; Chudzik, M.; Nan, Ce‐Wen; Goretta, K. C.

doi:10.1016/s0921-4534(96)00655-7

Cited by 13 publications

(8 citation statements)

References 21 publications

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“…The gate voltage can be used to change the carrier density of superconducting surfaces and therefore the critical temperature in the same manner as in field effect semiconductor devices. This effect has been investigated for more than 40 years 1 and has continuously gained experimental interest, 2, 3,4,5,6 see also the overview. 7 The critical temperature of thin superconducting layers can be controlled in this way by an electric field applied perpendicular to the layer.…”

Section: Introductionmentioning

confidence: 99%

Surface energy and magnetocapacitance of superconductors under electric field bias

et al. 2008

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A superconducting layer exposed to a perpendicular electric field and a parallel magnetic field is considered within the Ginzburg-Landau (GL) approach. The GL equation is solved near the surface and the surface energy is calculated. The nucleation critical field of superconducting state at the surface depends on the magnetic and electric fields. Special consideration is paid to the induced magnetic-field effect caused by diamagnetic surface currents. The latter effect is strongly dependent on the thickness of the sample. The effective inverse capacitance determines the effective penetration depth. It is found that the capacitance exhibits a jump at the surface critical field. An experiment is suggested for determining the change in the effective capacitance of the layer.

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Section: Introductionmentioning

confidence: 99%

Surface energy and magnetocapacitance of superconductors under electric field bias

et al. 2008

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“…Moreover, not all the processes are easily applicable to BSCCO hightemperature phases that are characterised by a very narrow field of existence as single phase in the phase diagram [ 11- [3]. A multi-step procedure modified from [4] was successfully applied to prepare dense (2223) BSCCO with high critical current density.…”

Section: Introductionmentioning

confidence: 99%

A multi-step process to improve texturing and transport current in BSCCO (2223) superconductors

Tampieri

Celotti

Calestani³

1999

IEEE Trans. Appl. Supercond.

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Abslruct-Bulk BSCCO(2223) was prepared by a multi-step process (high cold pressing + pressureless sintering + hot-forging): the final density of the samples exceeds 95% and the orientation factor increases up to *86%.It was found that the process phenomenology is strictly linked to the starting powder stoichiometry and characteristics: when composition is very near to the theoretical (2223), effects of secondary phase extrusion are observed during hot-forging, yielding a purification and inhibition of (2212) formation, accompanied by an appreciable increase of J, respect to hotpressed samples. When Ca/Sr ratio is considerably >1, recrystallisation of (2223) from the liquid takes place, with a remarkable improvement of critical current density (Jc > lo4 A/cm2). In this case, the non-superconducting secondary phases act as intrinsic oxygen reservoir. Finally, when composition diverges even more from (2223) (CdSr >>1 and Cu excess), the formation of too many precipitates of non-superconducting phases hinders the texturing process and more in general deteriorates the intergranular properties.

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“…A wide experimental activity on high-T c superconductors has been devoted to this change of the critical temperature and transport properties due to an external electric field. 6,7,2,8,3,9 Consequently a considerable theoretical effort has been made to describe such field effects. [10][11][12] Usually two standard mechanisms have been proposed in high-T c cuprates; 13 see Ref.…”

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confidence: 99%

“…The influence of static electric fields on superconducting properties has been investigated for nearly 40 years [1] but has gained renewed experimental interest [2,3,4], see also overview in [5]. Recently, field-induced superconductivity in a spin-ladder cuprate, where the critical temperature raised to 14 K by applying high gate voltages has been reported [6].…”

mentioning

confidence: 99%

“…Recently, field-induced superconductivity in a spin-ladder cuprate, where the critical temperature raised to 14 K by applying high gate voltages has been reported [6]. A wide experimental activity on high-T c superconductors has been devoted to this change of the critical temperature and transport properties due to an external electric field [7,8,2,9,3,10]. Consequently a considerable theoretical effort has been made to describe such field effects [11,12,13].…”

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confidence: 99%

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Electric-field dependence of pairing temperature and tunneling in high-temperature superconductors

Morawetz

2002

Phys. Rev. B

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Using the Bethe-Salpeter equation including high electric fields, the dependence of the critical temperature of onsetting superconductivity on the applied field is calculated analytically. The critical temperature of pairing is shown to increase with the applied field strength. This is a new field effect and could contribute to the explanation of recent experiments on field-induced superconductivity. From the field dependence of the BetheSalpeter equation, the two-particle bound-state solution is obtained as a resonance with a tunneling probability analogous to the WKB solution of a single particle confined in a potential and coupled to an electrical field.The influence of static electric fields on superconducting properties has been investigated for nearly 40 years 1 but has gained renewed experimental interest; 2-4 see also overview in Ref. 5. A wide experimental activity on high-T c superconductors has been devoted to this change of the critical temperature and transport properties due to an external electric field. 6,7,2,8,3,9 Consequently a considerable theoretical effort has been made to describe such field effects. [10][11][12] Usually two standard mechanisms have been proposed in high-T c cuprates; 13 see Ref. 5 and citations therein. The first one describes the changes of hole concentration due to Coulomb force of the external field and the second mechanism describes the field-induced oxygen rearrangement. 14 These mechanisms will change the density of state and consequently the order parameter. As a result one expects frustration of charge density waves 15 connected with specific threshold electric fields 16 and a nonlinear conductivity. 17 However, the nonlinear field dependence of the current showed that there must be a field effect besides the change of carrier density. 4 For very clean and thin two-dimensional ͑2D͒ structures with high transversal electric fields one can expect that the pairing mechanism by itself and the two-particle correlations will be influenced by the field since the direct current as the dominant effect of the field is suppressed by the geometry. This was first investigated in a quasi-one-dimensional conductor. 18 For general dimensions one best works within the field-dependent Bethe-Salpeter equation. We will find that the pairing mechanism is affected itself analogously to the formation of sidebands in the density of states due to high fields for one-particle properties. 19 Here we will show that the two-particle Bethe-Salpeter equation becomes field dependent and consequently also the resulting critical temperature. In an earlier paper 20 it was demonstrated that the inclusion of high electric fields leads to novel modifications of the two-particle properties: ͑i͒ The bound states, reflected by the value of the phase shift at low energies, are turned into resonances. ͑ii͒ The Pauli-blocking effect ͑which turns the phase shift to negative values, indicating effective repulsive behavior of the scattering͒ is suppressed by the applied field. This is understood as the opening o...

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Electric field effect in (BiPb)2Sr2Ca2Cu3Ox superconductor bars

Cited by 13 publications

References 21 publications

Surface energy and magnetocapacitance of superconductors under electric field bias

Surface energy and magnetocapacitance of superconductors under electric field bias

A multi-step process to improve texturing and transport current in BSCCO (2223) superconductors

Electric-field dependence of pairing temperature and tunneling in high-temperature superconductors

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