Destruction of superconductivity through phase fluctuations in ultrathin a-MoGe films

Abstract

We investigate the evolution of superconductivity with decreasing film thickness in ultrathin amorphous MoGe (a-MoGe) films using a combination of sub-Kelvin scanning tunneling spectroscopy, magnetic penetration depth measurements and magneto-transport measurements. We observe that superconductivity is strongly affected by quantum and classical phase fluctuations for thickness below 5 nm. The superfluid density is strongly suppressed by quantum phase fluctuations at low temperatures and evolves towards a linear-T dependence at higher temperatures. This is associated with a rapid decrease in the superconducting transition temperature, Tc, and the emergence of a pronounced pseudogap above Tc. These observations suggest that at strong disorder the destruction of superconductivity follows a Bosonic route where the global superconducting state is destroyed by phase fluctuations even though the pairing amplitude remains finite.

References in corpus (42)

• The pseudogap in high-temperature superconductors: an experimental survey
• Scanning tunneling spectroscopy of high-temperature superconductors
• Vanishing of phase coherence in underdoped Bi_2Sr_2CaCu_2O_8+d
• Localization of preformed Cooper-pairs in disordered superconductors
• Nature of the superconductor-insulator transition in disordered superconductors
• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Inhomogeneous Pairing in Highly Disordered s-wave Superconductors
• Role of Spatial Amplitude Fluctuations in Highly Disordered s-Wave Superconductors
• Eigenfunction fractality and pseudogap state near superconductor-insulator transition
• Superconducting properties and Hall Effect of epitaxial NbN thin films
• Single and two-particle energy gaps across the disorder-driven superconductor-insulator transition
• Phase fluctuations in a strongly disordered s-wave superconductor close to the metal-insulator transition
• Pseudogap in a thin film of a conventional superconductor
• Phase diagram of a strongly disordered s-wave superconductor, NbN, close to the metal-insulator transition
• Disorder induced multifractal superconductivity in monolayer niobium dichalcogenides
• Penetration depth and tunneling studies in very thin epitaxial NbN films
• Role of the vortex-core energy on the Beresinkii-Kosterlitz-Thouless transition in thin films of NbN
• Effective action for Superconductors and BCS-Bose crossover
• Emergence of nanoscale inhomogeneity in the superconducting state of a homogeneously disordered conventional superconductor, NbN
• Universal scaling of the order-parameter distribution in strongly disordered superconductors
• Fluctuations, dissipation, and nonuniversal superfluid jumps in two-dimensional superconductors
• Collective energy gap of preformed Cooper-pairs in disordered superconductors
• The low-energy phase-only action in a superconductor: a comparison with the XY model
• Melting of the vortex lattice through intermediate hexatic fluid in a-MoGe thin film
• Phase fluctuations, dissipation and superfluid stiffness in d-wave superconductors
• Robustness of the Berezinskii-Kosterlitz-Thouless Transition in Ultrathin NbN Films near the Superconductor-Insulator Transition
• Superfluid density and phase relaxation in superconductors with strong disorder
• A dynamical study of phase fluctuations and their critical slowing down in amorphous superconducting films
• Tunneling studies in a homogeneously disordered s-wave superconductor: NbN
• Optical excitation of phase modes in strongly disordered superconductors
• Spectroscopic evidence for strong correlations between local superconducting gap and local Altshuler-Aronov density-of-states suppression in ultrathin NbN films
• Frequency dependent superfluid stiffness in the pseudogap regime in strongly disordered NbN thin films
• Anomalous gap edge dissipation in disordered superconductors on the brink of localization
• The unusual thickness dependence of superconductivity in $\alpha$-MoGe thin films
• Coulomb Blockade of Tunneling between Disordered Conductors
• Broadening of the Berezinskii-Kosterlitz-Thouless transition by correlated disorder
• On the application of Mattis-Bardeen theory in strongly disordered superconductors
• Conductivity Due to Classical Phase Fluctuations in a Model For High-T_c Superconductors
• A 350 mK, 9 T scanning tunneling microscope for the study of superconducting thin films and single crystals
• Pseudo-gap in tunneling spectra as a signature of inhomogeneous superconductivity in oxide interfaces
• Disordered XY model: effective medium theory and beyond
• Tunneling probe of fluctuating superconductivity in disordered thin films

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