Measurement of the magnetic penetration depth of a superconducting MgB${}_2$ thin film with a large intraband diffusivity

Abstract

We report the temperature dependent magnetic penetration depth $\lambda (T)$ and the superconducting critical field $H_{c2}(T)$ in a 500-nm MgB${}_2$ film. Our analysis of the experimental results takes into account the two gap nature of the superconducting state and indicates larger intraband diffusivity in the three-dimensional (3D) $\pi$ band compared to that in the two-dimensional (2D) $\sigma$ band. Direct comparison of our results with those reported previously for single crystals indicates that larger intraband scattering in the 3D $\pi$ band leads to an increase of $\lambda$. We calculated $\lambda$ and the thermodynamic critical field $H_c\approx$2000 Oe employing the gap equations for two-band superconductors. Good agreement between the measured and calculated $\lambda$ value indicates the two independent measurements, such as magnetic force microscopy and transport, provide a venue for investigating superconducting properties in multi-band superconductors.

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Cited by in corpus (3)

• Direct measurement of the magnetic penetration depth by magnetic force microscopy
• Magnetic penetration-depth measurements of a suppressed superfluid density of superconducting Ca${}_{0.5}$Na${}_{0.5}$Fe${}_2$As${}_2$ single crystals by proton irradiation
• Meissner Effect and Nonreciprocal Charge Transport in Non-Topological 1T-CrTe2/FeTe Heterostructures