Stabilization of the dissipation-free current transport in inhomogeneous MgB 2 thin films

Treiber, S.; Stahl, Claudia; Schütz, Gisela; Soltan, S.; Albrecht, J.

doi:10.1016/j.physc.2014.08.004

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…The self-field of the supercurrents leads to vortex interactions and to a smearing out of the power-law behavior [38]. For many superconductors J c (T) can be fitted over the whole temperature range with a fixed exponent s=1.5 [39].…”

Section: Sample Preparationmentioning

confidence: 99%

Soft-magnetic coatings as possible sensors for magnetic imaging of superconductors

Ionescu

Simmendinger

Bihler

et al. 2019

Supercond. Sci. Technol.

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Magnetic imaging of superconductors typically requires a soft-magnetic material placed on top of the superconductor to probe local magnetic fields. For reasonable results the influence of the magnet onto the superconductor has to be small. Thin YBCO films with soft-magnetic coatings are investigated using SQUID magnetometry. Detailed measurements of the magnetic moment as a function of temperature, magnetic field and time have been performed for different heterostructures. It is found that the modification of the superconducting transport in these heterostructures strongly depends on the magnetic and structural properties of the soft-magnetic material. This effect is especially pronounced for an inhomogeneous coating consisting of ferromagnetic nanoparticles.

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Section: Sample Preparationmentioning

confidence: 99%

Soft-magnetic coatings as possible sensors for magnetic imaging of superconductors

Ionescu

Simmendinger

Bihler

et al. 2019

Supercond. Sci. Technol.

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“…The decisive property for the decay of the current density j(T) is the ratio of the vortex pinning energy U 0 and the thermal energy kT [22]. j 0 is the initial current density after preparation of the critical state and t 0 a characteristic time that is correlated with the sequence of preparation and measurement of the critical state [23,25]. t 0 is of the order of few seconds.…”

Section: Inhomogeneous Superconductorsmentioning

confidence: 99%

Quantitative magneto-optical analysis of the role of finite temperatures on the critical state in YBCO thin films

Albrecht

Brück

Stahl

et al. 2016

Supercond. Sci. Technol.

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We use quantitative magneto-optical microscopy to investigate the influence of finite temperatures on the critical state of thin YBCO films. In particular, temperature and time dependence of supercurrents in inhomogeneous and anisotropic films are analyzed to extract the role of temperature on the supercurrents themselves and the influence of thermally activated relaxation. We find that inhomogeneities and anisotropies of the current density distribution correspond to a different temperature dependence of local supercurrents. In addition, the thermally activated decay of supercurrents can be used to extract local vortex pinning energies. With these results the modification of vortex pinning introduced by substrate structures is studied. In summary the local investigation of supercurrent densities allows the full description of the vortex pinning landscape with respect to pinning forces and energies in superconducting films with complex properties under the influence of finite temperatures.

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Stabilization of the dissipation-free current transport in inhomogeneous MgB 2 thin films

Cited by 2 publications

References 16 publications

Soft-magnetic coatings as possible sensors for magnetic imaging of superconductors

Soft-magnetic coatings as possible sensors for magnetic imaging of superconductors

Quantitative magneto-optical analysis of the role of finite temperatures on the critical state in YBCO thin films

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