Vortex Variable Range Hopping in a Conventional Superconducting Film

Abstract

The behavior of a disordered amorphous thin film of superconducting Indium Oxide has been studied as a function of temperature and magnetic field applied perpendicular to its plane. A superconductor-insulator transition has been observed, though the isotherms do not cross at a single point. The curves of resistance vs. temperature on the putative superconducting side of this transition, where the resistance decreases with decreasing temperature, obey two-dimensional Mott variable-range hopping of vortices over wide ranges of temperature and resistance. To estimate the parameters of hopping, the film is modeled as a granular system and the hopping of vortices is treated in a manner analogous to hopping of charges. The reason the long range interaction between vortices over the range of magnetic fields investigated does not lead to a stronger variation of resistance with temperature than that of two-dimensional Mott variable-range hopping remains unresolved.

arXiv comment7 pages, 7 figures

References in corpus (19)

• Nature of the Quantum Metal in a Two-Dimensional Crystalline Superconductor
• Metallic ground state in an ion-gated two-dimensional superconductor
• Dissipation effects on the superconductor-insulator transition in 2-D superconductors
• The Elusive Bose Metal
• On the existence of a Bose Metal at T=0
• Magnetically Induced Metallic Phase in Superconducting Tantalum Films
• The Bose Metal: gauge field fluctuations and scaling for field tuned quantum phase transitions
• True Superconductivity in a 2D "Superconducting-Insulating" System
• A Phase Glass is a Bose Metal: New Conducting State in 2D
• Self Duality and a possible Hall-insulator phase near the superconductor-to-insulator transition in two-dimensional indium-oxide films
• Composite fermions and the field-tuned superconductor-insulator transition
• Microwave Spectroscopy Evidence of Superconducting Pairing in the Magnetic-Field-Induced Metallic State of InO${}_x$ Films at Zero Temperature
• Vortex Tunneling and Transport Theory In Two-Dimensional Bose Condensates
• Power law resistivity behavior in 2D superconductors across the magnetic-field tuned superconductor-insulator transition
• Dissipative phases across the superconductor-to-insulator transition
• Electrostatic Tuning of the Properties of Disordered Indium Oxide Films near the Superconductor-Insulator Transition
• Coulomb gap triptychs, $\sqrt{2}$ effective charge, and hopping transport in periodic arrays of superconductor grains
• Quantum vortex tunneling in $YB{a}_{2}C{u}_3{O}_{7-\delta }$ thin films
• Resistance of Josephson Junction Arrays at Low Temperatures

Cited by in corpus (3)

• Extreme Sensitivity of the Superconducting State in Thin Films
• Structural dynamics in thermal-treatment of amorphous indium-oxide films
• Effect of external electromagnetic radiation on the anomalous metallic behaviors in Ta thin films