Superconducting Properties of High-Purity Niobium

Finnemore, D. K.; Stromberg, T. F.; Swenson, C. A.

doi:10.1103/physrev.149.231

Cited by 439 publications

(227 citation statements)

References 53 publications

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“…Accurate measurements are available for pure niobium [18][19][20] showing that for t ≤ 0.5 the temperature dependence of the upper critical field H c2 and of the thermodynamical critical field H c agrees to within a few percent with the Gorter-Casimir expressions…”

Section: The Upper Critical Fieldmentioning

confidence: 75%

Fluxon pinning in niobium films

Benvenuti

Calatroni

Darriulat

et al. 2001

Physica C: Superconductivity

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Section: The Upper Critical Fieldmentioning

confidence: 75%

Fluxon pinning in niobium films

Benvenuti

Calatroni

Darriulat

et al. 2001

Physica C: Superconductivity

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“…Details on the preparation of the films are presented elsewhere [3]. The critical temperature of the film under discussion is T c = 9.25 K, equal to the one of high purity single crystals [20]. The residual resistance ratio is R(300 K)/R(10 K)=6.8 ( ̺ n ≈ 10 µΩcm just above T c ).…”

Section: Preparation Of the Films And Experimental Detailsmentioning

confidence: 99%

Relaxation measurements in the regime of the second magnetization peak in Nb films

Σταμόπουλος¹,

Niarchos²

2004

Physica C: Superconductivity

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We report on magnetic measurements as a function of field, temperature and time (relaxation) in superconducting Nb films of critical temperature Tc = 9.25 K. The magnetic measurements as a function of field exhibited a "second magnetization peak" ("SMP") which in general is accompanied by thermomagnetic instabilities (TMIs). The lines H′′ smp ′′ (T ) where the "SMP" occurs and the H fj (T ) where the first flux jump in the virgin magnetization curves is observed, end at a characteristic point (To, Ho) ≈ (7.2 K,80 Oe). Relaxation measurements showed that for T < To ≈ 7.2 K the activation energy Uo and the normalized relaxation rate S exhibit non-monotonic behavior as a function either of temperature or field. The extrema observed in Uo and S coincide with the points Hon(T ) or H′′ smp ′′ (T ) of the "SMP". In the regime T > To ≈ 7.2 K both Uo and S present a conventional monotonic behavior. These results indicate that the "SMP" behavior observed in our Nb films is promoted by the anomalous relaxation of the magnetization.

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“…The nonlinearity of log B͑z͒ plots is marginal, which is coherent with the theory in view of the fairly high of the studied samples. For example, of pure Nb ͑residual resistivity ratio RRR = 1600͒ is 1.3 at 3 K and 1.0 at 7 K. 11 However, in Ref. 10 of less pure Nb ͑RRR = 133͒ is reported to be 0.7͑2͒.…”

mentioning

confidence: 97%

Evidence for nonmonotonic magnetic field penetration in a type-I superconductor

et al. 2008

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Polarized neutron reflectometry (PNR) provides evidence that nonlocal electrodynamics governs the magnetic field penetration in an extreme low-κ superconductor. The sample is an indium film with a large elastic mean free path (11 µm) deposited on a silicon oxide wafer. It is shown that PNR can resolve the difference between the reflected neutron spin asymmetries predicted by the local and nonlocal theories of superconductivity. The experimental data support the nonlocal theory, which predicts a nonmonotonic decay of the magnetic field.

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Superconducting Properties of High-Purity Niobium

Cited by 439 publications

References 53 publications

Fluxon pinning in niobium films

Fluxon pinning in niobium films

Relaxation measurements in the regime of the second magnetization peak in Nb films

Evidence for nonmonotonic magnetic field penetration in a type-I superconductor

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