Two-band superconductivity has become an important topic over the past ten years.
Extensive experimental and theoretical studies started with MgB 2 and are now focused on …

In the first three years since the discovery of Fe-based high T c superconductors, scanning
tunneling microscopy (STM) and spectroscopy have shed light on three important questions …

The new family of unconventional iron-based superconductors discovered in 2006
immediately relieved their copper-based high-temperature predecessors as the most …

Materials that break multiple symmetries allow the formation of four-fermion condensates
above the superconducting critical temperature (T c). Such states can be stabilized by phase …

Superconductors are classified by their pairing mechanism and the coupling strength,
measured as the ratio of the energy gap, 2 Δ, to the critical temperature, T c. We present an …

We used high-resolution scanning tunneling spectroscopy to study the hole-doped iron
pnictide superconductor Ba 0.6 K 0.4 Fe 2 As 2 (T c= 38 K). Features of a bosonic excitation …

We report the full complex dielectric function of high-purity Ba 0.68 K 0.32 Fe 2 As 2 single
crystals with T c= 38.5 K determined by wideband spectroscopic ellipsometry at …

Since the discovery in 2008 of high-temperature superconductivity in the iron pnictides and
chalcogenides, a central issue has been the microscopic origin of the superconducting …

Among the iron-based superconductors,“122”-type compounds have been widely studied
due to the availability of high-quality single crystals. However, due to lack of a natural …

Optical conductivity of Ba0.6K0.4Fe2As2: The effect of in-plane and out-of-plane do** in the
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