I review theoretical ideas and implications of experiments for the gap structure and symmetry
of the Fe-based superconductors. Unlike any other class of unconventional …

Technological progress in material synthesis, as well as artificial realization of condensed
matter scenarios via ultra-cold atomic gases in optical lattices or epitaxial growth of thin …

Spin–orbit coupling is a fundamental interaction in solids that can induce a broad range of
unusual physical properties, from topologically non-trivial insulating states to unconventional …

Superconductivity arises from two distinct quantum phenomena: electron pairing and long-
range phase coherence. In conventional superconductors, the two quantum phenomena …

Here, we experimentally study the origin of d-electron heavy fermion (HF) behavior in iron-
based superconductors (FeSCs) A Fe 2 As 2 (A= K, Rb, Cs). Nuclear magnetic resonance …

The lack of nesting of the electron and hole Fermi-surface sheets in the Fe-based
superconductor LiFeAs, with a critical temperature of 18 K, has led to questions as to …

We report on 75As-NMR measurements in single crystalline BaFe2 (As0. 96P0. 04) 2 for
magnetic fields parallel to the orthorhombic [110] o and [100] o directions above the …

As 75 NMR measurements have been made on single crystals to study the nematic state in
the iron arsenides NaFeAs, which undergoes a structural transition from a high-temperature …

We present an inelastic neutron scattering study on single-crystalline LiFeAs devoted to the
characterization of the incommensurate antiferromagnetic fluctuations at Q=(0.5±δ, 0.5∓ δ …

A non-trivial temperature evolution of superconductivity including a temperature-induced
phase transition between two superconducting phases or even a time-reversal symmetry …