Unconventional superconductors often feature competing orders, small superfluid density,
and nodal electronic pairing. While unusual superconductivity has been proposed in the …

In a superconductor electrons form pairs and electric transport becomes dissipation-less at
low temperatures. Recently discovered iron-based superconductors have the highest …

We construct the symmetry adapted low-energy effective Hamiltonian for the electronic
states in the vicinity of the Fermi level in iron-based superconductors. We use Luttinger's …

FeSe exhibits a novel ground state in which superconductivity coexists with a nematic order
in the absence of any long-range magnetic order. Here, we report on an angle-resolved …

Recent experiments have shown that the phase diagrams of the kagome superconductors
AV 3 Sb 5 are strongly impacted by changes in the c-axis lattice parameter. Here, we show …

We study the orbital-selective superconducting pairing in a five-orbital tJ 1-J 2 model for iron
pnictides. Depending on the orbital selectivity of electron correlations and the orbital …

The coexisting regime of spin-density wave (SDW) and superconductivity in iron pnictides
represents a novel ground state. We have performed high-resolution angle-resolved …

Although the origin of high temperature superconductivity in the iron pnictides is still under
debate, it is widely believed that magnetic interactions or fluctuations have a crucial role in …

We report 75 As nuclear magnetic resonance studies on an underdoped single-crystal Ba
0.77 K 0.23 Fe 2 As 2 with T c= 16.5 K. Below TN= 46 K, the NMR peaks for H∥ c split and …

We argue that superconductivity in the coexistence region with spin-density-wave (SDW)
order in weakly doped Fe pnictides erdiffers qualitatively from the ordinary s+-state outside …