Z. G. Chen

Electronic properties of single-crystalline Fe1.05Te and Fe1.03Se0.30Te0.70

We report on a comprehensive study of the transport, specific heat, magnetic susceptibility and optical spectroscopy on single crystal of Fe

Persistent high-energy spin excitations in iron-pnictide superconductors

_{1.05}

Infrared spectrum and its implications for the electronic structure of the semiconducting iron selenide K0.83Fe1.53Se2

Te. We confirm that Fe

Formation of partial energy gap below the structural phase transition and the rare-earth element-substitution effect on infrared phonons in ReFeAsO (Re=La, Nd, and Sm)

_{1.05}

Optical spectroscopy of single-crystalline LaFeAsO

Te undergoes a first-order phase transition near 65 K. However, its physical properties are considerably different from other parent compounds of FeAs-based systems, presumably attributed to the presence of excess Fe ions. The charge transport is rather incoherent above the transition, and no clear signature of the gap is observed below the transition temperature. Strong impurity scattering effect exists also in Se-doped superconducting sample Fe

Field-induced spin-flop transitions in single-crystalline CaCo2As2

_{1.03}

High energy pseudogap and its evolution with doping in Fe-based superconductors as revealed by optical spectroscopy.

Se

Hybridization gap versus hidden-order gap in URu2Si2 as revealed by optical spectroscopy

_{0.30}

Single-crystal growth and optical conductivity of SrPt2As2 superconductors

Te

Continuous magnetic phase transition in half-frustrated Ca2Os2O7

_{0.70}