Shielding effects in ceramic superconductors

Niculescu, H.; Schmidmeier, Rainer; Topolski, Betina; Gielisse, P. J.

doi:10.1016/0921-4534(94)90818-4

Cited by 18 publications

(12 citation statements)

References 33 publications

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“…In [15], the field attenuation due to a thick BSCCO film on a cylindrical silver substrate was found to be frequency-independent. The same results were established for superconducting disks made from YBCO powder and subjected to perpendicular fields [20,21]. Yet other studies on bulk BSCCO tubes [3,22] measured a field attenuation that decreases with frequency, whereas the attenuation was shown to slowly increase with frequency for a YBCO superconducting tube [23].…”

Section: Introductionsupporting

confidence: 72%

Spectra of quantum systems in superstrong inertial force fields

Денисов¹,

Kravtsov²

2002

Quantum Electron.

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We have experimentally studied the magnetic shielding properties of a cylindrical shell of BiPbSrCaCuO subjected to low frequency AC axial magnetic fields. The magnetic response has been investigated as a function of the dimensions of the tube, the magnitude of the applied field and the frequency. These results are explained quantitatively by employing the method of Brandt (1998 Phys. Rev. B 58 6506) with a J c (B) law appropriate for a polycrystalline material. Specifically, we observe that the applied field can sweep into the central region either through the thickness of the shield or through the opening ends, the latter mechanism being suppressed for long tubes. For the first time, we systematically detail the spatial variation of the shielding factor (the ratio of the applied field over the internal magnetic field) along the axis of a high-temperature superconducting tube. The shielding factor is shown to be constant in a region around the centre of the tube, and to decrease as an exponential in the vicinity of the ends. This spatial dependence comes from the competition between two mechanisms of field penetration. The frequency dependence of the shielding factor is also discussed and shown to follow a power law arising from the finite creep exponent n.

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Section: Introductionsupporting

confidence: 72%

Spectra of quantum systems in superstrong inertial force fields

Денисов¹,

Kravtsov²

2002

Quantum Electron.

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“…for resistanceless cables above 77 K. However there are some low-J c applications [1][2][3], in particular magnetic shielding at very low frequencies [3][4][5][6]. Most potential applications require a critical current density J c as high as possible, e.g.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Treatment on YBa2Cu3O7-x Thick Films Prepared by Electrophoretic Deposition on Ni and Ag Substrates

et al. 2007

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We have studied the sintering parameters of YBa 2 Cu 3 O 7-x (YBCO) coatings produced by electrophoretic deposition (EPD) on Ag and Ni substrates. The maximal sintering temperature is ~ 930∞C due to partial melting and chemical contamination for Ag and Ni substrates respectively. Increasing the sintering duration does not improve significantly the densification. When Ar sintering atmosphere is used, the coating density is strongly increased on Ag substrates while adhesion is poor on Ni substrates. The Ar-sintered YBCO coating deposited on planar Ag substrate displays a significant magnetic shielding effect for low frequency applied magnetic induction.

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“…where m is the deposited mass (g), C the suspension concentration (g/cm 3 ), u e the electrophoretic mobility (cm 2 s -1 V -1 ), S the deposit area (cm 2 ), E the electric field in the suspension (V cm -1 ) and t the deposition time (s). The deposited mass of coatings is related to these different parameters.…”

Section: Epd Parametersmentioning

confidence: 99%

“…Some applications, such as no-loss electrical power transmission, need as high a critical current density (J c ) as possible. Other applications do not necessarily require high values of J c [1] and low J c applications have been studied [2,3]. For magnetic shielding of low frequency magnetic fields, the YBa 2 Cu 3 O 7-x (YBCO) superconductor compound displays very promising properties.…”

Section: Introductionmentioning

confidence: 99%

Preparation of YBa2Cu3O7-x superconducting thick films by the electrophoretic deposition method

et al. 2006

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YBa 2 Cu 3 O 7-x thick films have been realised by the Electrophoretic Deposition method (EPD). The influence of several parameters (powder and iodine concentrations in the suspension, applied voltage and deposition time) on the EPD process has been studied by measuring the conductivity of the suspension and the amount of YBa 2 Cu 3 O 7-x particles deposited on the electrode. Superconducting coatings onto silver substrates have been produced by a multilayer process during different deposition times. The highest critical current density value of these coatings measured by the four-point probe method is about 10 3 A/cm 2 (77 K), in a suitable range for magnetic shielding applications.

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Shielding effects in ceramic superconductors

Cited by 18 publications

References 33 publications

Spectra of quantum systems in superstrong inertial force fields

Spectra of quantum systems in superstrong inertial force fields

Influence of Thermal Treatment on YBa2Cu3O7-x Thick Films Prepared by Electrophoretic Deposition on Ni and Ag Substrates

Preparation of YBa2Cu3O7-x superconducting thick films by the electrophoretic deposition method

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