We demonstrate the existence of a novel superconducting state in high quality two-
component MgB 2 single crystalline superconductors where a unique combination of both …

Recent observation of unusual vortex patterns in MgB 2 single crystals raised speculations
about possible “type-1.5” superconductivity in two-band materials, mixing the properties of …

The magnetic vortices in superconductors usually repel each other. Several cases are
discussed when the vortex interaction has an attractive tail, and thus a minimum, leading to …

Abstract The Ginzburg-Landau functional for a two-gap superconductor is derived within the
weak-coupling BCS model. The interaction between the two condensates is described by a …

We have measured the low-temperature specific heat C (T) for polycrystalline MgB 2
prepared by high pressure synthesis. C (T) below 10 K vanishes exponentially, which …

In high-quality c-axis-oriented MgB 2 thin films, we observed high critical current densities (J
c) of∼ 16 MA/cm 2 at 15 K under self-fields comparable to those of cuprate high …

Single crystals of MgB 2 with a size up to 1.5× 0.9× 0.2 mm 3 have been grown with a high
pressure cubic anvil technique. The crystal growth process is very peculiar and involves an …

We report on measurements of the magnetic moment in superconducting MgB 2 single
crystals. We find μ 0 H c 2 c (0)= 3.2 T, μ 0 H c 2 ab (0)= 14.5 T, γ= 4.6, μ 0 H c (0)= 0.28 T …

This review focuses on the most important features of the 40 K superconductor MgB 2—the
weakly interacting multiple bands (the σ and π bands) and the distinct multiple …

In type-1.5 superconductors, vortices emerge in clusters, which grow in size with increasing
magnetic field. These vortex clusters and their field dependence are directly visualized by …