A. M. Mack
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Anomalous hopping exponents of ultrathin metal films Open
The temperature dependence of the resistance R(T) of ultrathin\nquench-condensed films of Ag, Bi, Pb and Pd has been investigated. In the most\nresistive films, R(T)=Roexp(To/T)^x, where x=0.75. Surprisingly, the exponent x\nwas found to b…
The Superconductor-Insulator Transition in 2D Open
The superconductor-insulator transition of ultrathin films of bismuth, grown on liquid helium cooled substrates, has been studied. The transition was tuned by changing both film thickness and perpendicular magnetic field. Assuming that the…
Evidence of Vortices on the Insulating Side of the Superconductor-Insulator Transition Open
The magnetoresistance of ultrathin insulating films of Bi has been studied\nwith magnetic fields applied parallel and perpendicular to the plane of the\nsample. Deep in the strongly localized regime, the magnetoresistance is\nnegative and …
Evidence of a T=0 Quantum Critical Point Associated with the Crossover from Weak to Strong Localization Open
A crossover between logarithmic and exponential temperature dependence of the conductance (weak and strong localization) has been observed in ultrathin films of metals deposited onto substrates held at liquid helium temperatures. The resis…
Nuclear structure studies at intermediate energies Open
This report discusses the following topics: inelastic scattering of 650 MeV protons from {sup 194,196}Pt; search for recoil free {Delta}-production in the (p,{sup 3}He) reaction at 650 MeV; search for low lying magnetic states in {sup 48}T…