Calculation of the upper critical field of V/Ag and Nb/Cu superlattices

Koperdraad, R. T. W.; Lodder, A.

doi:10.1103/physrevb.51.9026

Cited by 16 publications

(30 citation statements)

References 23 publications

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“…[2][3][4][5][6][7] For the first solution, the fitted parameters are close to what one knows from the measurements. However, the dimensional crossover, typical for S/N multilayers, appeared to lie at a much higher temperature than the measured one.…”

Section: Introductionmentioning

confidence: 60%

Influence of the boundary resistivity on the proximity effect

Ciuhu

Lodder

2001

Phys. Rev. B

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We apply the theory of Takahashi and Tachiki in order to explain theoretically the dependence of the upper critical magnetic field of a S/N multilayer on the temperature. This problem has been already investigated in the literature, but with a use of an unphysical scaling parameter for the coherence length. We show explicitly that, in order to describe the data, such an unphysical parameter is unnecessary if one takes into account the boundary resisitivity of the S/N interface. We obtain a very good agreement with the experiments for the multilayer systems Nb/Cu and V/Ag, with various layer thicknesses.

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Section: Introductionmentioning

confidence: 60%

Influence of the boundary resistivity on the proximity effect

Ciuhu

Lodder

2001

Phys. Rev. B

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“…These are the systems for which a dimensional crossover is observed in the parallel upper critical field, that is, of which the layers have intermediate thicknesses. 9 The earlier Ref. 10 presented results according to the second solution, which is characterized by a ratio N S D S /N N D N well below one.…”

Section: ͑18͒mentioning

confidence: 99%

“…It was concluded that no thorough comparison of theory and experiment existed that considers absolute magnitudes of both parallel and perpendicular upper critical fields in multilayers of various layer thicknesses. We made an attempt 9,10 to such a comparison for two related systems: V/Ag and Nb/Cu. The exact solutions were calculated of the well-known TakahashiTachiki equations, 11 which constitute the most advanced proximity-effect theory currently available.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic-coherence-length scaling in metallic multilayers

Koperdraad

Lodder

1996

Phys. Rev. B

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An improved description of the critical properties of metallic multilayers is obtained by introducing the concept of a scaled magnetic coherence length in the Takahashi-Tachiki theory. By that, the absolute magnitude of the upper critical fields and the position of the dimensional crossover are uncoupled and become independent quantities. Much better phase diagrams can be obtained by using this scaling procedure. Although this concept is inspired by the character of disagreement between the theory without scaling and experiment, the procedure lacks an external justification. The fact that it works might serve as an indication how the Takahashi-Tachiki theory has to be modified in order to give a realistic quantitative description of upper critical fields in real metallic multilayers. The theory is applied to the V/Cu, V/Ag, Nb/Cu, and Nb/Ag systems. ͓S0163-1829͑96͒06425-9͔

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“…This is the best studied S/normal metal (N) proximity coupled multilayer [16,17] and, even very recently, many papers have been devoted to studying fundamental physical properties of this system [14,15,18,19]. The samples have been prepared by using two different deposition techniques, sputtering and molecular beam epitaxy (MBE).…”

Section: Introductionmentioning

confidence: 99%

Interface transparency and proximity effect in Nb/Cu triple layers realized by sputtering and molecular beam epitaxy

Tesauro¹,

Aurigemma²,

Cirillo³

et al. 2004

Supercond. Sci. Technol.

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We have investigated, in the framework of the proximity effect theory, the interface transparency T between Nb and Cu in the case of high quality Nb/Cu trilayers fabricated by molecular beam epitaxy (MBE) and sputtering deposition techniques. The obtained T values do not seem to be strongly influenced by the fabrication methods but more by the intrinsic properties of the two metals; a slightly higher value for T has even been deduced for the MBE prepared samples. The proximity effect in these samples has also been studied in the presence of an external magnetic field. In the parallel configuration a significant shift towards lower values of the 2D-3D crossover temperature has been observed for MBE samples, in good agreement with very recent theoretical predictions. In the perpendicular case a positive curvature of the temperature dependence of the upper critical field has been detected, which was less pronounced for sputtered samples. Both the effects have been observed only for trilayers with low Nb thickness (<600 Å) which confirms the crucial influence of the interface transparency on the values of the upper critical field in such samples.

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Calculation of the upper critical field of V/Ag and Nb/Cu superlattices

Cited by 16 publications

References 23 publications

Influence of the boundary resistivity on the proximity effect

Influence of the boundary resistivity on the proximity effect

Magnetic-coherence-length scaling in metallic multilayers

Interface transparency and proximity effect in Nb/Cu triple layers realized by sputtering and molecular beam epitaxy

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