The discovery of superconductivity at relatively higher temperatures in a non-cuprate
system, LnFeAsO 1− x F x (Ln= lanthanides) has created tremendous activity among the …

Measurements of London penetration depth, a sensitive tool to study multiband
superconductivity, have provided several important insights into the behavior of Fe-based …

Transport and magnetic studies are performed on high-quality FeTe 0.60 Se 0.40 single
crystals to determine the upper critical field (H c2), lower critical field (H c1) and the critical …

A review of our investigations on single crystals of LnFeAsO1− xFx (Ln= La, Pr, Nd, Sm, Gd)
and Ba1− xRbxFe2As2 is presented. A high-pressure technique has been applied for the …

We report on specific heat (C p), transport, Hall probe, and penetration depth measurements
performed on Fe (Se 0.5 Te 0.5) single crystals (T c∼ 14 K). The thermodynamic upper …

We present a careful study of the resistive superconducting transition in FeSe single crystals
down to T= 40 mK in continuous magnetic fields up to 30 T applied perpendicular and …

Local magnetic measurements are used to quantitatively characterize heterogeneity and flux
line pinning in PrFeAsO 1− y and NdFeAs (O, F) superconducting single crystals. In spite of …

The superconducting penetration depth λ (T) has been measured in R FeAsO 0.9 F 0.1 (R=
La, Nd) single crystals (R-1111). In Nd-1111, we find an upturn in λ (T) upon cooling and …

High-energy electron irradiation at low temperatures is an efficient and controlled way to
create vacancy–interstitial Frenkel pairs in a crystal lattice, thereby inducing nonmagnetic …

The lower critical magnetic field, H c 1, of superconductors is measured by optical
magnetometry using ensembles of nitrogen-vacancy centers in diamond. The technique is …