Universal self-field critical current for thin-film superconductors

Talantsev, E. F.; Tallon, J. L.

doi:10.1038/ncomms8820

Cited by 100 publications

(173 citation statements)

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“…This may well be understandable, at least in terms of traditional vortex models where the pinning microstructure is inescapably variable. However, building on previous work [6] we show here that, under self-field conditions (zero external field), this universal goal can be achieved using a London-Meissner model in which transport becomes dissipative when, for type I superconductors, the surface current density reaches the depairing magnitude, B c /(μ 0 λ) or, for type II superconductors, B c1 /(μ 0 λ). Here B c is the thermodynamic critical field, B c1 the lower critical field and λ is the London penetration depth.…”

Section: Introductionmentioning

confidence: 56%

“…As noted, the foundations of our approach were established recently. [6] We analyzed J c (sf) for thin films of half thickness, b ≈ λ, in terms of transport London currents for which dissipation commences when the global current density reaches, for type I superconductors:…”

Section: Modelmentioning

confidence: 99%

“…Our key new contribution here is that we introduce an extended Bardeen-Cooper-Schrieffer (BCS) model to calculate λ(T ) from the T -dependent superconducting energy gap, (T ), for either weak-or strongcoupling superconductors. Because the self-field critical current density can be expressed purely in terms of λ [6] we are thus able to fit J c (T, sf) data to extract key thermodynamic parameters from (T ), in particular λ(0), (0) and the jump in electronic specific heat at T c , C/C. As a consequence, these parameters may be determined in a manner which is simple and direct, in contrast with the more conventional methods for measuring these quantities which are generally complex.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

2017

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Key questions for any superconductor include: what is its maximum dissipation-free electrical current (its 'critical current') and can this be used to extract fundamental thermodynamic parameters? Present models focus on depinning of magnetic vortices and implicate materials engineering to maximise pinning performance. But recently we showed that the self-field critical current for thin films is a universal property, independent of microstructure, controlled only by the penetration depth. Here we generalise this observation to include thin films, wires or nanowires of singleor multi-band s-wave and d-wave superconductors. Using extended BCS equations we consider dissipation-free self-field transport currents as London-Meissner currents, avoiding the concept of pinning altogether. We find quite generally, for type I or type II superconductors, the current is limited by the relevant critical field divided by the penetration depth. Our fits to 64 available data sets, from zinc nanowires to compressed sulphur hydride with critical temperatures of 0.65 to 203 K, respectively, are excellent. Extracted London penetration depths, superconducting energy gaps and specific heat jumps agree well with reported bulk values. For multiband or multiphase samples we accurately recover individual band contributions and phase fractions.

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Section: Introductionmentioning

confidence: 56%

Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

2017

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“…We note that this compares well with the doping induced in other systems using ILs. 21 In an effort to better define the link between our measurements and the standard transport properties of YBCO, we made use of the recent work by Talantsev and Tallon, which links the self field critical current density of a broad spectrum of superconductors in thin film form with their London penetration depth k. 22 According to them, experimental data show that as long as the film is thinner than its penetration depth (in YBCO k > 100 nm), the self-field J c is simply H c;1 =k. Making use of the standard Ginzburg-Landau expression for H c;1 leads to J c ðsfÞ / k À3 .…”

mentioning

confidence: 99%

Ionic liquid gating of ultra-thin YBa2Cu3O7−x films

Fête

Rossi

Augieri

et al. 2016

Applied Physics Letters

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In this paper, we present a detailed investigation of the self-field transport properties of an ionic liquid gated ultra-thin YBa2Cu3O7−x (YBCO) film. From the high temperature dynamic of the resistivity (>220 K), different scenarios pertaining to the interaction between the liquid and the thin film are proposed. From the low temperature evolution of Jc and Tc, a comparison between the behavior of our system and the standard properties of YBCO is drawn.

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“…Type II superconductors are typically used for applications and they also can sustain only the finite currents. The maximum value of J c is related to the lower critical field H c1 as indicated in recent experiments studying the properties of current currying superconductors [93][94][95], where some universalities observed in a number of different families of superconductors with various symmetries of the order parameter have been pointed out. Among all, it has been shown that for thin films of thickness b less than the penetration depth λ, there exist a limiting value of the current J c which for type I superconductors is H c /λ, whereas for type II materials H c1 /λ, where H c1 is the lower critical field [93].…”

Section: Jhep10(2016)152mentioning

confidence: 99%

Condensate flow in holographic models in the presence of dark matter

Rogatko

Wysokiński

2016

J. High Energ. Phys.

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Holographic model of a three-dimensional current carrying superconductor or superfluid with dark matter sector described by the additional U(1)-gauge field coupled to the ordinary Maxwell one, has been studied in the probe limit. We investigated analytically by the Sturm-Liouville variational method, the holographic s-wave and p-wave models in the background of the AdS soliton as well as five-dimensional AdS black hole spacetimes. The two models of p-wave superfluids were considered, the so called SU(2) and the Maxwell-vector. Special attention has been paid to the dependence of the critical chemical potential and critical transition temperature on the velocity of the condensate and dark matter parameters. The current J in holographic three-dimensional superconductor studied here, shows the linear dependence on T c − T for both s and p-wave symmetry. This is in a significant contrast with the previously obtained results for two-dimensional superconductors, which reveal the (T − T c ) 3/2 temperature dependence. The coupling constant α, as well as, chemical potential µ D and the velocity S D of the dark matter, affect the critical chemical potential of the p-wave holographic SU(2) system. On the other hand, α, dark matter velocity S D and density ρ D determine the actual value of the transition temperature of the same superconductor/superfluid set up. However, the dark matter does not affect the value of the current.

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Universal self-field critical current for thin-film superconductors

Cited by 100 publications

References 59 publications

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

Ionic liquid gating of ultra-thin YBa2Cu3O7−x films

Condensate flow in holographic models in the presence of dark matter

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