Synthesis and Characterization of Al- and SnO-Doped ZnO Thermoelectric Thin Films.

The effect of SnO addition (0, 1, 2, 4 wt.%) on thermoelectric properties of -axis oriented Al-doped ZnO thin films (AZO) fabricated by pulsed laser deposition on silica and AlO substrates was investigated. The best thermoelectric performance was obtained on the AZO + 2% SnO thin film grown on silica, with a power factor () of 211.

Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCaFeAsF.

We report the critical current density () and vortex pinning properties in single crystals of a novel iron-based superconductor (IBS) KCaFeAsF with large in the pristine state, before and after introduction of artificial defects by swift-particle irradiation. The effects of 2.6 GeV U and 3 MeV proton irradiations in KCaFeAsF single crystals on transition temperature and , including its dose dependence, are systematically studied.

Superconductivity at 38 K at an electrochemical interface between an ionic liquid and FeSeTe on various substrates.

Superconducting FeSeTe thin films on SrTiO, LaAlO and CaF substrates were electrochemically etched in an ionic liquid, DEME-TFSI, electrolyte with a gate bias of 5 V. Superconductivity at 38 K was observed on all substrates after the etching of films with a thickness greater than 30 nm, despite the different T values of 8 K, 12 K and 19 K observed before etching on SrTiO, LaAlO and CaF substrates, respectively. T returned to its original value with the removal of the gate bias.

Hall-plot of the phase diagram for Ba(Fe1-xCox)2As2.

The Hall effect is a powerful tool for investigating carrier type and density. For single-band materials, the Hall coefficient is traditionally expressed simply by , where e is the charge of the carrier, and n is the concentration. However, it is well known that in the critical region near a quantum phase transition, as it was demonstrated for cuprates and heavy fermions, the Hall coefficient exhibits strong temperature and doping dependencies, which can not be described by such a simple expression, and the interpretation of the Hall coefficient for Fe-based superconductors is also problematic.

Oxypnictide SmFeAs(O,F) superconductor: a candidate for high-field magnet applications.

The recently discovered oxypnictide superconductor SmFeAs(O,F) is the most attractive material among the Fe-based superconductors due to its highest transition temperature of 56 K and potential for high-field performance. In order to exploit this new material for superconducting applications, the knowledge and understanding of its electro-magnetic properties are needed. Recent success in fabricating epitaxial SmFeAs(O,F) thin films opens a great opportunity to explore their transport properties.