A Quantum Current Standard Based on Phase Slip

We show that it is possible to fabricate a device, based on a superconducting nanowire, to demonstrate the existence of coherent quantum phase slip (QPS). If coherent QPS exists, this device will form the basis of a new type of quantum current standard capable of closing the metrological triangle

Effect of Non-Stoichiometry Oxygen Content on the Magnetization of La(1.5)Sr(0.5)NiO(4+delta)

We report on magnetization measurements of La1.5Sr0.5NiO4+delta for delta = 0.01 and delta = -0.01. Zero field-cooled and field-cooled bulk magnetization measurements were performed parallel to the Ni-O planes of single crystals, and on a polycrystalline delta = 0.01 sample. Striking differences in the magnetization curves are observed between the two doping levels that are identifiable in polycrystalline delta = 0.01. The bulk magnetization differences indicate a crossover in the magnetic properties of La2-xSrxNiO4+delta at half doping level, which can be used as a simple non-destructive way to determine whether La1.5Sr0.5NiO4+delta is under or over half doping