Nonlocal Effects on the Magnetic Penetration Depth in<i>d</i>-Wave Superconductors

Kosztin, Ioan; Leggett, Anthony J.

doi:10.1103/physrevlett.79.135

Cited by 174 publications

(202 citation statements)

References 20 publications

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“…Kosztin and Leggett [119] first pointed out that since the BCS coherence length defined as , the two processes would be difficult to distinguish. However, unlike the effect from impurities, the predicted nonlocality is dependent upon the orientation of the magnetic field and sample boundaries.…”

Section: Nonlocal Electrodynamics Of Nodal Superconductorsmentioning

confidence: 99%

Magnetic penetration depth in unconventional superconductors

Prozorov

Giannetta

2006

Supercond. Sci. Technol.

417

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: Nonlocal Electrodynamics Of Nodal Superconductorsmentioning

confidence: 99%

Magnetic penetration depth in unconventional superconductors

Prozorov

Giannetta

2006

Supercond. Sci. Technol.

417

438

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“…5 . This presents a conundrum-mechanisms such as impurity pair-breaking 20,21 and nonlocal electrodynamics 22 should cause a crossover to quadratic temperature dependence, but attempts to understand the behaviour in terms of impurity physics require unrealistically high levels of disorder 23 . Measurements of the frequency-dependent superfluid density offer the potential for new insights into this problem.…”

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confidence: 99%

Nodal quasiparticle dynamics in the heavy fermion superconductor CeCoIn5 revealed by precision microwave spectroscopy

et al. 2013

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CeCoIn 5 is a heavy fermion superconductor with strong similarities to the high-T c cuprates, including quasi-two-dimensionality, proximity to antiferromagnetism and probable d-wave pairing arising from a non-Fermi-liquid normal state. Experiments allowing detailed comparisons of their electronic properties are of particular interest, but in most cases are difficult to realize, due to their very different transition temperatures. Here we use low-temperature microwave spectroscopy to study the charge dynamics of the CeCoIn 5 superconducting state. The similarities to cuprates, in particular to ultra-clean YBa 2 Cu 3 O y , are striking: the frequency and temperature dependence of the quasiparticle conductivity are instantly recognizable, a consequence of rapid suppression of quasiparticle scattering below T c ; and penetration-depth data, when properly treated, reveal a clean, linear temperature dependence of the quasiparticle contribution to superfluid density. The measurements also expose key differences, including prominent multiband effects and a temperature-dependent renormalization of the quasiparticle mass.

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“…1 More recently the concept of nonlocality was applied to high-T c cuprates. 2 In the nonlocal theory B͑z͒ deviates from a simple exponential decay; it is nonmonotonic and, moreover, changes sign at a specific depth. 1 In the pure limit ͑ 0 Ӷ ᐉ͒ B͑z͒ is a function of the intrinsic parameters L ͑T =0͒ and 0 , and the temperature T. The magnitude of this nonlocal effect is determined by the ratio 0 / L ͑0͒ ϰ 1 / ; the smaller the Ginzburg-Landau parameter , the bigger the nonlocal effect.…”

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confidence: 99%

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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Nonlocal Effects on the Magnetic Penetration Depth ind-Wave Superconductors

Cited by 174 publications

References 20 publications

Magnetic penetration depth in unconventional superconductors

Magnetic penetration depth in unconventional superconductors

Nodal quasiparticle dynamics in the heavy fermion superconductor CeCoIn5 revealed by precision microwave spectroscopy

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

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