Angular dependence of the upper critical field in Nb/CuMn multilayers

Attanasio, C.; Coccorese, C.; Mercaldo, Lucia V.; Salvato, M.; Maritato, L.; Lykov, A. N.; Prischepa, S. L.; Falco, Charles M.

doi:10.1103/physrevb.57.6056

Cited by 21 publications

(16 citation statements)

References 25 publications

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“…The most clear evidences for layeredness, such as the observation of interlayer Josephson effect [15] and intrinsic pinning [16], have not been found yet for iron-based compounds. On the other hand, a cusplike 2D behavior of angular dependence of magnetoresistance observed for some iron-based superconductors [19,20] reminds the aforementioned 3D-2D crossover in layered superconductors [12,17].…”

Section: Introductionsupporting

confidence: 54%

“…The well-known signature of layeredness is a dimensional 3D-2D crossover. It occurs upon decreasing of temperature and is due to temperature variation of the coherence length ξ (T ) [12][13][14][15][16][17]. Close to T c , the ξ (T ) is larger than the separation between layers s and the superconductor is in a spatially averaged 3D state.…”

Section: Introductionmentioning

confidence: 99%

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Unusual two-dimensional behavior of iron-based superconductors with low anisotropy

et al. 2017

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We study angular-dependent magnetoresistance in iron-based superconductors Ba 1−x Na x Fe 2 As 2 and FeTe 1−x Se x . Both superconductors have relatively small anisotropies γ ∼ 2 and exhibit a three-dimensional (3D) behavior at low temperatures. However, we observe that they start to exhibit a profound two-dimensional behavior at elevated temperatures and in applied magnetic field parallel to the surface. We conclude that the unexpected two-dimensional (2D) behavior of the studied low-anisotropic superconductors is not related to layeredness of the materials, but is caused by appearance of surface superconductivity when magnetic field exceeds the upper critical field H c2 (T ) for destruction of bulk superconductivity. We argue that the corresponding 3D-2D bulk-to-surface dimensional transition can be used for accurate determination of the upper critical field.

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Section: Introductionsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Unusual two-dimensional behavior of iron-based superconductors with low anisotropy

et al. 2017

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“…Moreover, the use of a spin-glass alloy like CuMn as spacer opens up the possibility to easily obtain a large range of anisotropy values by changing the Mn percentage or the Nb and CuMn relative thicknesses. 4,[20][21][22] By comparing the superconducting behaviors in the samples with and without antidots and with different anisotropy values, we point out the influence of the antidot array on the vortex properties. Multilayers without antidots behave coherently to what has already been reported in the literature.…”

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confidence: 99%

Evidence of vortex kink formation in antidotted layered superconductors

et al. 2002

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The angular dependence of the critical current density J c in external magnetic field has been measured in Nb/CuMn multilayers with and without a regular array of antidots. The multilayers without antidots behave coherently to what has already been reported in the literature, showing, for sufficiently high anisotropy, dissipation related only to the magnetic-field component perpendicular to the layers, H Ќ . This behavior is generally explained in terms of the presence of kinked vortices. The kink formation has been directly detected in the antidotted samples, where low angle modulation of J c , related to single vortex kinks entering the system, has been found. The presence of kinks explains also the unusual scaling of J c vs H Ќ found at low anisotropy in the antidotted case up to a value of the angle related to the geometrical structure of the system.

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“…27 As a result, for certain values of superconducting layer thickness and of the thickness of interlayers separating them, the dimensional crossover could be observed on the angular dependence H c ͑⌰͒ when the 3D mode at ⌰ = / 2 changes smoothly into 2D dependence as the angle ⌰ decreases to zero. 12,[28][29][30] Apart from this aspect other theoretical attempts have been done to describe the whole H c ͑⌰͒ curve mainly for infinite multilayers of different coupling nature between S layers. [31][32][33][34][35][36] On the other hand, the finiteness of the multilayers samples ͑i.e., the precise position of the superconducting nucleus͒ has been found to be a very important parameter in determining, for example, the resistive transition to the superconducting state 16 and the shape of the H-T phase diagram.…”

Section: H Cmentioning

confidence: 99%

“…[2][3][4][5][6][7][8][9][10][11][12] In particular, rather comprehensive understanding of the nature of the dimensional crossover-namely, the transition from three-dimensional ͑3D͒ to two-dimensional ͑2D͒ mode upon a variation of the temperature T-leads to deeper insight into the interaction between the superconducting layers and into the superconducting phase nucleation. [13][14][15] Recently, 16,17 we have shown that the dimensionality of finite S/N multilayers can be influenced by the "odd-even" effect related to the sample finiteness ͑in particular, the number of bilayers, odd or even͒ which determines the nucleation position of the superconducting phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of geometrical symmetry on the angular dependence of the critical magnetic field in superconductor/normal metal multilayers

et al. 2005

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The angular dependence of the upper critical field, H c ͑⌰͒, for Nb/ Pd multilayers with different geometrical symmetries ͑i.e., with an even or an odd number of bilayers, N bil ͒ and thickness of Nb and Pd layers of the order of superconducting coherence length were investigated ͑the angle ⌰ is here defined from the plane parallel to the sample surface͒. The presence of an angular dimensional crossover at some temperature dependent angle ⌰ * ͑T͒ was established. At angles ⌰Ͻ⌰ * ͑T͒ the multilayers are in two-dimensional mode while at ⌰Ͼ⌰ * ͑T͒ they are in a three-dimensional one. In addition, the sample with odd N bil has a larger value of ⌰ * ͑T͒ with respect to the sample with even N bil . The experimental results have been qualitatively explained in the framework of the Ginzburg-Landau theory. It was shown that the main features of the H c ͑⌰͒ dependences in samples with even and odd N bil values are related to the different localizations of the superconducting order parameter.

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Angular dependence of the upper critical field in Nb/CuMn multilayers

Cited by 21 publications

References 25 publications

Unusual two-dimensional behavior of iron-based superconductors with low anisotropy

Unusual two-dimensional behavior of iron-based superconductors with low anisotropy

Evidence of vortex kink formation in antidotted layered superconductors

Effect of geometrical symmetry on the angular dependence of the critical magnetic field in superconductor/normal metal multilayers

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