Penetration depths of high <i>T</i>
                  <i>c</i> films measured by two-coil mutual inductances

Fiory, A. T.; Hebard, A. F.; Mankiewich, P. M.; Howard, R. E.

doi:10.1063/1.99757

Cited by 200 publications

(79 citation statements)

References 5 publications

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“…This is typically done using a mutual inductance technique with drive and pickup coils on opposite sides of the film, well away from any edges. [66,125] It is sometimes possible to obtain Muon spin rotation (μSR) has been widely used to determine ( ) 0 λ . The details are complicated and we refer the reader to the literature for details.…”

Section: Penetration Depth In Anisotropic Samplesmentioning

confidence: 99%

Magnetic penetration depth in unconventional superconductors

Prozorov

Giannetta

2006

Supercond. Sci. Technol.

418

438

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Abstract. This topical review summarizes various features of magnetic penetration depth in unconventional superconductors. Precise measurements of the penetration depth as a function of temperature, magnetic field and crystal orientation can provide detailed information about the pairing state. Examples are given of unconventional pairing in hole-and electron-doped cuprates, organic and heavy fermion superconductors. The ability to apply an external magnetic field adds a new dimension to penetration depth measurements. We discuss how field dependent measurements can be used to study surface Andreev bound states, nonlinear Meissner effects, magnetic impurities, magnetic ordering, proximity effects and vortex motion. We also discuss how penetration depth measurements as a function of orientation can be used to explore superconductors with more than one gap and with anisotropic gaps. Details relevant to the analysis of penetration depth data in anisotropic samples are also discussed.Keywords: penetration depth, unconventional superconductivity, pairing symmetry IntroductionThe early suggestion that high temperature superconductors might exhibit unconventional, d-wave pairing, [24,11,154,8] has lead to a wide variety of new experimental probes with sensitivity sufficient to test this hypothesis. The pioneering work of Hardy and coworkers demonstrated that high resolution measurements of the London penetration depth could detect the presence of nodal quasiparticles characteristic of a d-wave pairing state [87]. Since that time, a large number of new superconductors have been discovered, many of which exhibit nontrivial departures from BCS behavior. As we show in this review, penetration depth measurements can be used to examine not only nodal quasiparticles but two-gap superconductivity, anisotropy of the energy gap, Andreev surface states, nonlinear Meissner effect, interplane transport, proximity coupled diamagnetism, vortex matter and the coexistence of magnetism and superconductivity, to name several problems of current interest.

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Section: Penetration Depth In Anisotropic Samplesmentioning

confidence: 99%

Magnetic penetration depth in unconventional superconductors

Prozorov

Giannetta

2006

Supercond. Sci. Technol.

418

438

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“…37 This should not present a problem for YBCO films possessing a ϭ0.5 m at 77 K. 19 Other experimental difficulties may be connected with the magnetic shielding material which should possess, at low temperatures, a high enough and a high saturation field ͑to be linear at HϳJ c ), and which should behave reversibly, i.e., exhibit no remanent magnetization. The size of the bulk magnets may turn out to be crucial too.…”

Section: H C1mentioning

confidence: 99%

Overcritical states of a superconductor strip in a magnetic environment

2000

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A current-carrying superconducting strip partly penetrated by magnetic flux and surrounded by a bulk magnet of high permeability is considered. Two types of samples are studied: those with critical current controlled by an edge barrier dominating over the pinning, and those with high pinning-mediated critical current masking the edge barrier. It is shown for both cases that the current distribution in a central flux-free part of the strip is strongly affected by the actual shape of the magnetic surroundings. Explicit analytical solutions for the sheet current and self-field distributions are obtained which show that, depending on the geometry, the effect may suppress the total loss-free transport current of the strip or enhance it by orders of magnitude. The effect depends strongly on the shape of the magnet and its distance to the superconductor but only weakly on the magnetic permeability.

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“…This field is orders of magnitude larger than the thermodynamic applied field where vortices would appear if not for the high freeenergy barrier for breaking nascent vortex-antivortex (V-aV) pairs. 1,2 The calculation is useful for determination of the inplane Ginzburg-Landau coherence length, ξ, from the onset of strong non-linear effects in two-coil experiments [3][4][5][6][7][8][9] for measuring the magnetic penetration depth, λ.…”

Section: Introductionmentioning

confidence: 99%

Upper limit of metastability of the vortex-free state of a two-dimensional superconductor in a nonuniform magnetic field

Lemberger

Ahmed

2013

Phys. Rev. B

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We calculate the magnetic field above which vortices necessarily appear in a two-dimensional superconducting film in a non-uniform magnetic field applied near its center, as in two-coil measurements of superfluid density. Experiments suggest that free vortices appear when the Meissner screening current density is large enough that the free-energy barrier for separating tightly-bound vortex-antivortex (V-aV) pairs into free vortices is comparable to k B T , not at the much lower thermodynamic critical field. Specifically, we calculate the applied magnetic field above which there exists no metastable state without vortices. There is a simple analogy with the appearance of phase-slip-centers in a one-dimensional superconducting wire. 74.25.Op, 75.40.Mg

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Penetration depths of high T c films measured by two-coil mutual inductances

Cited by 200 publications

References 5 publications

Magnetic penetration depth in unconventional superconductors

Magnetic penetration depth in unconventional superconductors

Overcritical states of a superconductor strip in a magnetic environment

Upper limit of metastability of the vortex-free state of a two-dimensional superconductor in a nonuniform magnetic field

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