Zhao Zhong-Xian

Superconductivity at 55 K in Iron-Based F-Doped Layered Quaternary Compound Sm[O1-xFx] FeAs

We report the superconductivity in iron-based oxyarsenide Sm[O1-xFx]FeAs, with the onset resistivity transition temperature at 55.0K and Meissner transition at 54.6 K. This compound has the same crystal structure as LaOFeAs with shrunk crystal lattices, and becomes the superconductor with the highest critical temperature among all materials besides copper oxides up to now.

Pseudogap and Superconducting Gap in Sm FeAs(O1-xFx) Superconductor from Photoemission Spectroscopy

High resolution photoemission measurements are carried out on non-superconducting SmOFeAs parent compound and superconducting SmFeAs(O1-xFx) (x = 0.12, and 0.15) compounds. The momentum-integrated spectra exhibit a clear Fermi cutoff that shows little leading-edge shift in the superconducting state. A robust feature at 13meV is identified in all these samples. Spectral weight suppression near Ef with decreasing temperature is observed in both undoped and doped samples that points to a possible existence of a pseudogap in these Fe-based compounds.

Strong Quantum Fluctuation of Vortices in Bulk Samples of the New Superconductor MgB2

By using transport and magnetic measurement, the upper critical field

Structural Properties of MgB2 Superconductors with a Critical Current Density Greater than 105A/cm2

H_{c2}(T)

Novel magnetic properties of complex TTFxC60Bry

and the irreversibility line

Superconducting Properties of MgB2 Prepared by High Pressure and Ambient Pressure

H_{irr}(T)

Common Features in Electronic Structure of the Oxypnictide Superconductors from Photoemission Spectroscopy

has been determined. A big separation between

New Superconductivity Dome in LaFeAsO1−xFx Accompanied by Structural Transition*

H_{c2}(0)

Stability and doping of infinite-layer compound (Ca1−xSrx) CuO2 at ambient pressure

and

Preparation and Characterization of the New Superconductor MgB2

H_{irr}(0)