Granularity in superconductors: intrinsic properties and processing-dependent effects

Passos, W. A. C.; Lisboa‐Filho, Paulo Noronha; Caparroz, Renato; Faria, C.C. de; Venturini, P.; Araújo‐Moreira, F. M.; Sergeenkov, S.; Ortiz, W.A.

doi:10.1016/s0921-4534(01)00045-4

Cited by 29 publications

(22 citation statements)

References 37 publications

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“…Otherwise, for extrinsic properties, it is understood the processing-dependent characteristics of a specimen or sample, such as grain size, grain-boundary conformance and the existence of secondary phases [11].…”

Section: Introductionmentioning

confidence: 99%

Extrinsic properties of colossal magnetoresistive samples

Lisboa‐Filho

Mombrú

Pardo

et al. 2004

Solid State Communications

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Section: Introductionmentioning

confidence: 99%

Extrinsic properties of colossal magnetoresistive samples

Lisboa‐Filho

Mombrú

Pardo

et al. 2004

Solid State Communications

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“…MO images are not only visually impressive, but also sensitive to determine field intensity profiles across the dendrites [4]. Another sensitive technique to detect the magnetic dendritic state is SQUID magnetometry [8], [9]. In fact, when in the magnetic dendritic state, a superconducting thin film behaves as a typical granular superconductor, whose magnetic response includes both intragranular and intergranular contributions.…”

Section: Introductionmentioning

confidence: 99%

Effects of small magnetic fields on the critical current of thin films

Passos

Lisboa‐Filho

Kang

et al. 2003

IEEE Trans. Appl. Supercond.

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Magnetic fields applied perpendicularly to superconducting thin films may produce dendritic patterns, where penetrated and Meissner regions coexist, as observed in Nb, YBCO and MgB 2 . Due to large demagnetizing factors in the perpendicular geometry, small fields may be enough to drive portions of the sample into the mixed state. Lack of symmetry and local defects might then permeate the dendritic mode. This mode, in turn, can be detected by AC-susceptibility measurements, since penetrated fingers act as intergranular material, which reveals itself in a characteristic manner.Films of a few hundred nanometers thick and millimeter lateral sizes, develop dendrites even when submitted to Earth's field, what drastically limits the critical current, . This contribution studies how this field-induced granularity is further affected by the action of excitation AC-fields of small magnitudes and audio-frequencies.

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“…Cc 00 of our 2D-JJA (for more details on the experimental technique and set-ups see [7][8][9]). Fig.…”

Section: Methodsmentioning

confidence: 99%

Influence of nonuniform critical current density profile on magnetic field behavior of AC susceptibility in 2D Josephson junction arrays

Araújo‐Moreira

Maluf

Sergeenkov

2004

Solid State Communications

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Employing mutual-inductance measurements, we study the magnetic field dependence of complex AC susceptibility of artificially prepared highly ordered (periodic) two-dimensional Josephson junction arrays of unshunted Nb-AlO x -Nb junctions. The observed behavior can be explained assuming single-plaquette approximation of the overdamped model with an inhomogeneous critical current distribution within a single junction. q

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Granularity in superconductors: intrinsic properties and processing-dependent effects

Cited by 29 publications

References 37 publications

Extrinsic properties of colossal magnetoresistive samples

Extrinsic properties of colossal magnetoresistive samples

Effects of small magnetic fields on the critical current of thin films

Influence of nonuniform critical current density profile on magnetic field behavior of AC susceptibility in 2D Josephson junction arrays

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