Point-contact spectroscopy was originally developed for the determination of the electron–
phonon spectral function in normal metals. However, in the past 20 years it has become an …

This paper explains the multi‐orbital band structures and itinerant magnetism of the iron‐
pnictide and chalcogenide superconductors. We first describe the generic band structure of …

The specific heat of high-purity Ba 0.68 K 0.32 Fe 2 As 2 single crystals with the highest
reported superconducting T c= 38.5 K was studied. The electronic specific heat C p below T …

Point-contact Andreev-reflection spectroscopy (PCAR) has proven to be one of the most
powerful tools in the investigation of superconductors, where it provides information on the …

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

Microwave measurements of the London penetration depth and critical temperature T c were
used to show evidence of a disordered-driven transition from s±to s++ order parameter …

Directional point-contact Andreev-reflection measurements in Ba (Fe 1-x Co x) 2 As 2 single
crystals (T c= 24.5 K) indicate the presence of two superconducting gaps with no line nodes …

One of the open issues concerning iron-based superconductors is whether the s±wave
model is able to account for the overall effects of impurity scattering, including the low rate of …

We report combined experimental and theoretical analysis of superconductivity in CaK (Fe
1− x Ni x) 4 As 4 (CaK1144) for x= 0, 0.017, and 0.034. To obtain the superfluid density ρ …

Графен представляет собой двумерную структуру, составленную из атомов углерода,
которые расположены в узлах кристаллической решетки типа пчелиные соты и …