This paper presents experimental and simulation results of a screening current induced magnetic field (SCF) in a high temperature superconductor (HTS) insert that constitutes a low-/high-temperature superconductor (LTS/HTS) NMR magnet. In this experiment, the HTS insert, a stack of 50 double-pancake coils, each wound with Bi2223 tape, was operated at 77 K. A screening current was induced in the...

Topological superconductors have been predicted to host exotic bound states commonly referred to as Majorana fermions, which can encode and process quantum information non-locally, thus evading many forms of decoherence. One can engineer a topological superconductor by coupling a conventional s-wave superconductor with the helical surface states present in a topological insulator. In this talk,...

We report on the fabrication of highly transparent superconductor/normal metal/two-dimensional electron gas junctions formed by a superconducting NbN electrode, a thin s10 nmd Au interlayer, and a two-dimensional electron gas in an InGaAs/ InP heterostructure. High junction transparency has been achieved by exploiting developed process of Au/NbN evaporation and rapid annealing at 400 °C. This a...

Slurries of powdered Bi2Sr2CaCu2O8+x (BSCCO-2212) superconductor in high-boiling alkanes were irradiated with intense ultrasound. Significant enhancements of magnetic irreversibility as well as transport critical current are reported. The effects are dependent on the concentration of the slurry and are optimal for 1.5 wt % slurry loading. Electron microscopy shows that ultrasonic treatment lead...

We suggest a mechanism that may resolve a conflict between the precession of a neutron star and the widely accepted idea that protons in the bulk of the neutron star form a type-II superconductor. We will show that if there is a persistent, non-dissipating current running along the magnetic flux tubes the force between magnetic flux tubes may be attractive, resulting in a type-I, rather than a ...

We calculate the tunneling conductance spectra of a ferromagnetic metal / insulator / triplet superconductor from the reflection amplitudes using the Blonder-Tinkham-Klapwijk (BTK) formula. For the triplet superconductor, we assume one special p-wave order parameter, having line nodes, and two two dimensional f -wave order parameters with line nodes, breaking the time reversal symmetry. Also we...

Muon-spin-relaxation experiments and ac low-field magnetization measurements have been carried out on the superconductor CeRu2. The relaxation rate of the muon-spin polarization in zero field exhibits a small but significant increase below TM.40 K, which is suppressed by applying a longitudinal field. This result taken together with magnetization measurements provides definite evidence for the ...

The critical current of a Josephson junction is an oscillatory function of the enclosed magnetic flux , because of quantum interference modulated with periodicity h/2e. We calculate these Fraunhofer oscillations in a two-dimensional (2D) ballistic superconductor–normal-metal–superconductor (SNS) junction. For a Fermi circle the amplitude of the oscillations decays as 1/ or faster. If the Fermi ...