Onset of Nernst Effect Beyond the Coherence Critical Field of a Nano-Scale Granular Superconductor

Abstract

We report measurements of the Nernst effect and of the magneto-resistance of granular aluminum films near the metal to insulator transition. These films show sharp transitions as a function of temperature and magnetic field. At low temperatures the Nernst signal displays a sharp peak at a field where more than 90% of the normal state resistance has been restored, suggesting a transition involving entropy transport after superconducting coherence has been destroyed. At temperatures higher than the critical temperature the fluctuation paraconductivity scales with the Nernst signal, in agreement with a description in terms of fluctuations of the order parameter.

arXiv comment6 pages, 7 figures

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Cited by in corpus (7)

• Shaping a superconducting dome: Enhanced Cooper-pairing versus suppressed phase coherence in coupled aluminum nanograins
• Interplay between kinetic inductance, non-linearity and quasiparticle dynamics in granular aluminum MKIDs
• Optical signatures of the superconducting Goldstone mode in granular aluminum: experiments and theory
• Granular superconductors for high kinetic inductance and low loss quantum devices
• Optical conductivity of granular aluminum films near the Mott metal-to-insulator transition
• Tunneling study in granular aluminum near the Mott metal-to-insulator transition
• The paraconductivity of granular Al-films at high reduced temperatures and magnetic fields