New features are reported in precision measurements of the complex microwave conductivity of high-quality YBa2Cu3O6.95 crystals grown in BaZrO3 crucibles. A third peak in the normal conductivity, s1(T), at around 80 K, and enhanced pair conductivity s2(T) below ;65 K are observed. The data are inconsistent with a single order parameter, and instead are indicative of multicomponent superconducti...

BaZrO3–BaTiO3 ceramics exhibit a shift in transformation temperatures as revealed by dielectric and viscoelastic spectroscopy; a phase diagram has been established. Sigmoid anomalies in Poisson’s ratio and bulk modulus during the ferroelastic transitions were observed in doped materials, which are not predicted by standard theories for phase transformations. “Hashin–Shtrikman” composite model w...

BaZrO3-based materials doped with a trivalent cation have excellent chemical stability and relatively high proton conductivity which makes them potential conducting oxide for various electrochemical device applications such as hydrogen processing, high-temperature electrolysis, solid electrolyte in fuel cells. However, BaZrO3 showed poor sinterability, requiring sintering temperatures (1700–210...

The high upper critical field and low anisotropy of the iron-based superconductor BaFe₂As₂ make it promising for its use in the construction of superconducting magnets. However, its critical current density in high magnetic fields needs to be improved. Here we demonstrate a simple, one-step and industrially scalable means of achieving just this. We show that introducing controlled amounts of un...