The current-phase (I-φ) relation of a double-barrier Josephson junction with a two-gap superconductor as intermediate electrode is derived by means of a simplified version of Ohta’s model. As in conventional double-barrier Josephson junctions, a marked skewness in the I-φ curves is present. Moreover, as in heterotic Josephson devices, a reduction of the maximum Josephson current is predicted. A...

We study the finite temperature electroweak phase transition in an external hypercharge U(1) magnetic field HY , using lattice Monte Carlo simulations. For sufficiently small fields, HY /T 2 <∼ 0.3, the magnetic field makes the first order transition stronger, but it still turns into a crossover for Higgs massesmH <∼ 80 GeV. For larger fields, we observe a mixed phase analogous to a type I supe...

It is expected that in the interior of compact stars a proton superconductor coexists with and couples to a neutron superfluid. Starting from a field-theoretical model for two complex scalar fields – one of which is electrically charged – we derive a GinzburgLandau potential which includes entrainment between the two fluids and temperature effects from thermal excitations of the two scalar fiel...

The superconductors with the Ginzburg-Landau (G-L) parameter ($\kappa$) $\sim1/\sqrt{2}$ exist near a critical Bogolomonyi (B) point where they show inter-type domains between type-I and type-II superconductivity. While such physics is well understood for isotropic superconductors, experimental investigation of anisotropic B-point remains an unattained goal mainly due to unavailability model ma...

Results of NMR measurement on high Tc oxide superconductor are reviewed together with heavy electron superconductor. In high Tc compounds, superconductivity and antiferromagnetism compete with each other, while in heavy electron system both coexist or compete. The property of Cooper pair is discussed in high T , superconductor together with the heavy electron superconductor. In the several syst...

The holographic superconductor is the dual of superconductivity, but there no Meissner effect in standard superconductor. This because boundary Maxwell field added as an external source and not dynamical. We show analytically by imposing semiclassical equation on AdS boundary. Unlike Ginzburg-Landau (GL) theory, extreme type I limit cannot be reached even $e\ensuremath{\rightarrow}\ensuremath{\...

I discuss some aspects of recent developments in color superconductivity in high density quark matter. I calculate the Cooper pair gap and the critical points at high density, where magnetic gluons are not screened. The ground state of high density QCD with three light flavors is shown to be a color-flavor locking state, which can be mapped into the low-density hadronic phase. The meson mass at...