218 citations · 955 across the 22 of their papers we have counts for
14 papers · 1 filter
Evidence for a universal minimum superfluid response in field-tuned disordered superconducting films measured using low frequency ac conductivity
Shashank Misra, Lukas Urban, Minsoo Kim +2
Our measurements of the low frequency ac conductivity in strongly disordered two-dimensional films near the magnetic field-tuned superconductor-to-insulator transition show a sudde…
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…
Superconductivity-Related Insulating Behavior
G. Sambandamurthy, L. W. Engel, A. Johansson +1
We present the results of an experimental study of superconducting, disordered, thin-films of amorphous Indium Oxide. These films can be driven from the superconducting phase to a…
Effect of granularity on the insulator-superconductor transition in ultrathin Bi films
G. Sambandamurthy, K. Das Gupta, N. Chandrasekhar
We have studied the insulator-superconductor transition (IST) by tuning the thickness in quench-condensed films. The resistive transitions of the superconducting films are smo…
Possible robust insulator-superconductor transition on solid inert gas and other substrates
K. Das Gupta, G. Sambandamurthy, Swati S. Soman +1
We present observations of the insulator-superconductor transition in ultrathin films of Bi on amorphous quartz, quartz coated with Ge, and for the first time, solid xenon condense…
Josephson junction array type I-V characteristics of quench-condensed ultra thin films of Bi
G. Sambandamurthy, K. DasGupta, V. H. S. Moorthy +1
In this communication we report studies of d.c current-voltage (I-V) characteristics of ultra thin films of Bi, quench condensed on single crystal sapphire substrates at T = 15K. T…
Magnetoresistance and conductivity exponents of quench-condensed ultra-thin films of Bi
K. Das Gupta, G. Sambandamurthy, V. H. S. Moorthy +1
We have studied the magnetoresistance (MR) and evolution of conductivity with thickness of quench-condensed Bismuth films on substrates of various dielectric constants. Our results…
Electrical transport properties of ultrathin disordered films
G. Sambandamurthy, K. DasGupta, N. Chandrasekhar
We report an experimental study of quench condensed () disordered ultrathin films of {\rm Bi} where localisation effects and superconductivity compete. Experiments…