Multicomponent superconductivity is realized in multiband superconductors when an
interband pairing interaction is considerably weaker than the intraband interactions. There is …

We analyze the evolution of the superconducting gap structure in strongly hole-doped Ba 1−
x K x Fe 2 As 2 between x= 1 and x∼ 0.4 (optimal doping). In the latter case, the pairing …

The recent discovery of iron pnictide superconductors has resulted in a rapidly growing
interest in multiband models with more than two bands. In this work we specifically focus on …

A conventional superconductor is described by a single complex order parameter field
which has two fundamental length scales, the magnetic field penetration depth λ and the …

We consider superconductivity in a system with N Fermi surfaces, including intraband and
interband effective electron-electron interactions. The effective interaction is described by an …

We study superconducting three-band systems within strong-coupling Eliashberg theory. In
particular, we search for phase-frustrated superconducting systems with spontaneous time …

We investigate some significant properties of multi-band superconductors. They are time-
reversal symmetry breaking, chirality and fractional quantum flux vortices in three-band …

Geometrical frustration leads to novel quantum phenomena such as the spin-liquid phase in
triangular and kagome lattices. Intraband and interband Fermi surface (FS) nesting can drive …

We show that a clean multiband superconductor may display one or several phase
transitions with increasing temperature from or to chiral superconducting states with broken …

Using a high-resolution differential technique we have determined the electronic specific
heat coefficient γ (T)= C el/T of Ba 1− x K x Fe 2 As 2 with x= 0 to 1.0, at temperatures (T) …