Creep effects on the Campbell response in type-II superconductors

Filippo, Gaggioli,; Blatter, G.; Geshkenbeǐn, V. B.

doi:10.1103/physrevresearch.4.013143

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…These have been developed in several stages: originating in the sixties of the last century, weak pinning and creep 9 has been further developed with the discovery of high temperature superconductors as a subfield of vortex matter physics 18 . Strong pinning was originally introduced by Labusch 8 and by Larkin and Ovchinnikov 9 and has been further developed recently with several works studying critical currents 10 , current-voltage characteristics 11,19 , magnetic field penetration 12,20,21 , and creep 13,21,22 ; results on numerical simulations involving strong pins have been reported in Refs. 23-25. The two theories come together at the onset of strong pinning: an individual defect is qualified as weak if it is unable to pin a vortex, i.e., a vortex traverses the pin smoothly.…”

Section: Introductionmentioning

confidence: 99%

Strong pinning transition with arbitrary defect potentials

Filippo¹,

Blatter²,

Buchacek³

et al. 2023

Preprint

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Section: Introductionmentioning

confidence: 99%

Strong pinning transition with arbitrary defect potentials

Filippo¹,

Blatter²,

Buchacek³

et al. 2023

Preprint

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Strong pinning transition with arbitrary defect potentials

Filippo

Blatter

Buchacek

et al. 2023

Phys. Rev. Research

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Single-gap isotropic $s-$wave superconductivity in single crystals AuSn$_4$

Ghimire,

Joshi,

Krenkel

et al. 2024

SciPost Phys.

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London, \lambda_L (T)λL(T), and Campbell, \lambda_{C} (T)λC(T), penetration depths were measured in single crystals of a topological superconductor candidate AuSn_44. At low temperatures, \lambda_L (T)λL(T) is exponentially attenuated and, if fitted with the power law, \lambda(T) \sim T^nλ(T)∼Tn, gives exponents n>4n>4, indistinguishable from the isotropic single s-s−wave gap Bardeen-Cooper-Schrieffer (BCS) asymptotic. The superfluid density fits perfectly in the entire temperature range to the BCS theory. The superconducting transition temperature, T_c = 2.40 ± 0.05Tc=2.40±0.05 K, does not change after 2.5 MeV electron irradiation, indicating the validity of the Anderson theorem for isotropic s-s−wave superconductors. Campbell penetration depth before and after electron irradiation shows no hysteresis between the zero-field cooling (ZFC) and field cooling (FC) protocols, consistent with the parabolic pinning potential. Interestingly, the critical current density estimated from the original Campbell theory decreases after irradiation, implying that a more sophisticated theory involving collective effects is needed to describe vortex pinning in this system. In general, our thermodynamic measurements strongly suggest that the bulk response of the AuSn_44 crystals is fully consistent with the isotropic s-s−wave weak-coupling BCS superconductivity.

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Creep effects on the Campbell response in type-II superconductors

Cited by 4 publications

References 27 publications

Strong pinning transition with arbitrary defect potentials

Strong pinning transition with arbitrary defect potentials

Strong pinning transition with arbitrary defect potentials

Single-gap isotropic $s-$wave superconductivity in single crystals AuSn$_4$

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