Search Results - "VallesJr, J. M"

Superconductor to Insulator Transition Tuned by Random Gauge Fields by Nguyen, H. Q, Hollen, S. M, VallesJr, J. M, Shainline, J, Xu, J. M

“…Typically the disorder that alters the interference of particle waves to produce Anderson localization is potential scattering from randomly placed impurities…”
Get full text

Disorder Influences the Quantum Critical Transport at a Superconductor to Insulator Transition by Nguyen, H. Q, Hollen, S. M, Shainline, J, Xu, J. M, VallesJr, J. M

“…Phys. Rev. B 92, 140501 (2015) We isolated flux disorder effects on the transport at the critical point of the quantum magnetic field tuned Superconductor to…”
Get full text

Cooper Pair Insulator phase induced in amorphous Pb$_0.9$Bi$_0.1$ thin films by Hollen, S. M, Shainline, J, Xu, J. M, VallesJr, J. M

“…A Cooper pair insulator (CPI) phase emerges near the superconductor-insulator transitions of a number of strongly-disordered thin film systems. Much recent…”
Get full text

Cooper pair islanding model of insulating nanohoneycomb films by Hollen, S. M, VallesJr, J. M

“…J. Phys.: Conf. Ser. 376 012002, 2012 We first review evidence for the Cooper pair insulator (CPI) phase in amorphous nanohoneycomb (NHC) films. We then extend…”
Get full text

Collapse of the Cooper pair phase coherence length at a superconductor to insulator transition by Hollen, S. M, Fernandes, G. E, Xu, J. M, VallesJr, J. M

“…We present investigations of the superconductor to insulator transition (SIT) of uniform a-Bi films using a technique sensitive to Cooper pair phase coherence…”
Get full text

Field Tuned Superconductor to Insulator Transitions in an Amorphous Film with an Imposed Multiply Connected Geometry by StewartJr, M. D, Yin, Aijun, Xu, J. M, VallesJr, J. M

“…We have observed multiple magnetic field driven superconductor to insulator transitions (SIT) in amorphous Bi films perforated with a nano-honeycomb (NHC)…”
Get full text

Cooper pair insulator in amorphous films induced by nanometer-scale thickness variations by Hollen, S. M, Nguyen, H. Q, Rudisaile, E, StewartJr, M. D, Shainline, J, Xu, J. M, VallesJr, J. M

“…Phys. Rev. B 84, 064528 (2011) Unusual transport properties of superconducting (SC) materials, such as the under doped cuprates, low dimensional…”
Get full text

Observation of Giant Positive Magnetoresistance in a Cooper Pair Insulator by Nguyen, H. Q, Hollen, S. M, StewartJr, M. D, Shainline, J, Yin, Aijun, Xu, J. M, VallesJr, J. M

“…Ultrathin amorphous Bi films, patterned with a nano-honeycomb array of holes, can exhibit an insulating phase with transport dominated by the incoherent motion…”
Get full text

Fluctuation Effects in High Sheet Resistance Superconducting Films by VallesJr, J. M, Chervenak, J. A, Hsu, S. -Y, Kouh, T. J

“…As the normal state sheet resistance, $R_n$, of a thin film superconductor increases, its superconducting properties degrade. For $R_n\simeq h/4e^2$…”
Get full text