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Excess noise in the anomalous metallic phase in amorphous indium oxide
André Haug, Dan Shahar
More than 25 years ago, unexpected metallic behavior was discovered on the superconducting side of the superconductor-to-insulator transition. To this day, the origin of this behav…
Direct observation of intrinsic surface magnetic disorder in amorphous superconducting films
Idan Tamir, Martina Trahms, Franzisca Gorniaczyk +3
The interplay between disorder and interactions can dramatically influence the physical properties of thin-film superconductors. In the most extreme case, strong disorder is able t…
Limited role of vortices in transport in highly disordered superconductors near
Adam Doron, Tal Levinson, Franzisca Gorniaczyk +2
At finite temperatures and magnetic fields, type-II superconductors in the mixed state have a non-zero resistance that is overwhelmingly associated with vortex motion. In this work…
The Critical Current of Disordered Superconductors near T=0
Adam Doron, Tal Levinson, Franzisca Gorniaczyk +2
An increasing current through a superconductor can result in a discontinuous increase in the differential resistance at the critical current. This critical current is typically ass…
Collective energy gap of preformed Cooper-pairs in disordered superconductors
Thomas Dubouchet, Benjamin Sacépé, Johanna Seidemann +3
In most superconductors the transition to the superconducting state is driven by the binding of electrons into Cooper-pairs. The condensation of these pairs into a single, phase co…
The Temperature dependence of the magneto-resistance peak in highly disordered superconductors
Adam Doron, Idan Tamir, Tal Levinson +2
Highly disordered superconductors have a rich phase diagram. At a moderate magnetic field (B) the samples go through the superconductor-insulator quantum phase transition. In the i…
Extreme Sensitivity of the Superconducting State in Thin Films
I. Tamir, A. Benyamini, E. J. Telford +12
All non-interacting two-dimensional electronic systems are expected to exhibit an insulating ground state. This conspicuous absence of the metallic phase has been challenged only i…
Absence of cyclotron resonance in the anomalous metallic phase in InO
Youcheng Wang, Idan Tamir, Dan Shahar +1
It is observed that many thin superconducting films with not too high disorder level (generally R) placed in magnetic field show an anomalous metallic phase wh…
Non-equilibrium restoration of duality symmetry in the vicinity of the superconductor-insulator transition
I. Tamir, A. Doron, T. Levinson +3
The magnetic field driven superconductor to insulator transition in thin films was theoretically analyzed via a vortex-charge duality transformation applied to the Hamiltonian. Vor…
Negative Magnetoresistance in Amorphous Indium Oxide Wires
Sreemanta Mitra, Girish C Tewari, Diana Mahalu +1
We study magneto-transport properties of several amorphous Indium oxide nanowires of different widths. The wires show superconducting transition at zero magnetic field, but, there…
High field termination of a Cooper-pair insulator
B. Sacepe, J. Seidemann, M. Ovadia +5
We conducted a systematic study of the disorder dependence of the termination of superconductivity, at high magnetic fields (B), of amorphous indium oxide films. Our lower disorder…
Little-Parks Oscillations in a Single Ring in the vicinity of the Superconductor-Insulator Transition
Doron Gurovich, Konstantin S. Tikhonov, Diana Mahalu +1
We present results of measurements obtained from a mesoscopic ring of a highly disordered superconductor. Superimposed on a smooth magnetoresistance background we find periodic osc…
Evidence for a Finite Temperature Insulator
M. Ovadia, D. Kalok, I. Tamir +3
In superconductors the zero-resistance current-flow is protected from dissipation at finite temperatures (T) by virtue of the short-circuit condition maintained by the electrons th…
Coherent quantum phase slip
O. V. Astafiev, L. B. Ioffe, S. Kafanov +5
A hundred years after discovery of superconductivity, one fundamental prediction of the theory, the coherent quantum phase slip (CQPS), has not been observed. CQPS is a phenomenon…
A Superconducting Gap in an Insulator
D. Sherman, G. Kopnov, D. Shahar +1
We present tunneling spectroscopy and transport measurements on disordered indium oxide films that reveal the existence of a superconducting gap in an insulating state. Two films o…
Electric breakdown effect in the current-voltage characteristics of amorphous indium oxide thin films near the superconductor-insulator transition
O. Cohen, M. Ovadia, D. Shahar
Current-voltage characteristics in the insulator bordering superconductivity in disordered thin films exhibit current jumps of several orders of magnitude due to the development of…
Localization of preformed Cooper-pairs in disordered superconductors
B. Sacepe, T. Dubouchet, C. Chapelier +5
The most profound effect of disorder on electronic systems is the localization of the electrons transforming an otherwise metallic system into an insulator. If the metal is also a…
Direct observation of quantum superconducting fluctuations in an insulating groundstate
N. P. Armitage, R. Crane, G. Sambandamurthy +3
We review our recent measurements of the complex AC conductivity of thin InO_x films studied as a function of magnetic field through the nominal 2D superconductor-insulator transit…
Fluctuations, dissipation, and nonuniversal superfluid jumps in two-dimensional superconductors
R. W. Crane, N. P. Armitage, A. Johansson +3
We report a comprehensive study of the complex AC conductivity of thin effectively 2D amorphous superconducting InO_x films at zero applied field. Below a temperature scale T_c0 wh…
Survival of superconducting correlations across the 2D superconductor-insulator transition: A finite frequency study
R. W. Crane, N. P. Armitage, A. Johansson +3
The complex ac conductivity of thin highly disordered InOx films was studied as a function of magnetic field through the nominal two-dimensional superconductor-insulator transition…
Angular dependence of the magnetic-field driven superconductor-insulator transition in thin films of amorphous indium-oxide
A. Johansson, N. Stander, E. Peled +2
A significant anisotropy of the magnetic-field driven superconductor-insulator transition is observed in thin films of amorphous indium-oxide. The anisotropy is largest for more di…
Nanowire Acting as a Superconducting Quantum Interference Device
A. Johansson, G. Sambandamurthy, N. Jacobson +2
We present the results from an experimental study of the magneto-transport of superconducting wires of amorphous Indium-Oxide, having widths in the range 40 - 120 nm. We find that,…
Power law resistivity behavior in 2D superconductors across the magnetic-field tuned superconductor-insulator transition
G. Sambandamurthy, A. Johansson, E. Peled +3
We present the results of a systematic study of thin-films of amorphous indium-oxide near the superconductor-insulator transition. We show that the film's resistivity follows a sim…
Experimental evidence for a collective insulating state in two-dimensional superconductors
G. Sambandamurthy, L. W. Engel, A. Johansson +2
We present the results of an experimental study of the current-voltage characteristics in strong magnetic field () of disordered, superconducting, thin-films of amorphous Indium…