Iron chalcogenide superconductors have become one of the most investigated
superconducting materials in recent years due to high upper critical fields, competing …

Single-crystalline, single-phase CaKFe 4 As 4 has been grown out of a high-temperature,
quaternary melt. Temperature-dependent measurements of x-ray diffraction, anisotropic …

The newly discovered iron-based high temperature superconductors have demonstrated
rich physical properties. Here we give a brief review on the recent studies of the upper …

An overview of the behavior of Fe-based superconductors (FBSs) in magnetic fields is given
with the emphasis on the materials features important for pinning of vortices, critical current …

We have investigated the temperature dependence of the upper critical field H c 2 (T) in a
LiFeAs single crystal by direct measurements of resistivity under static magnetic fields up to …

Electrical magnetoresistance and tunnel diode oscillator measurements were performed
under external magnetic fields up to 41 T applied along the crystallographic b axis (hard …

The upper critical field H c 2 (T) of the multiband superconductor KFe 2 As 2 has been
studied via low-temperature thermal expansion and magnetostriction measurements. We …

We report the phase diagram of λ-(BETS) 2 GaCl 4 [where BETS is bis (ethylene-dithio)
tetraselenafulvalene] from rf penetration depth measurements with a tunnel diode oscillator …

We report neutron inelastic-scattering measurements on the stoichiometric iron-based
superconductor LiFeAs. We find evidence for (i) magnetic scattering consistent with strong …

The upper critical field of multiband superconductors is an important quantity that can reveal
details about the nature of the superconducting pairing. Here we experimentally map out the …