X. H. Chen

Superconductivity at 43 K in SmFeAsO1-xFx.

Since the discovery of high-transition-temperature (high-Tc) superconductivity in layered copper oxides, extensive effort has been devoted to exploring the origins of this phenomenon. A Tc higher than 40 K (about the theoretical maximum predicted from Bardeen–Cooper–Schrieffer theory), however, has been obtained only in the copper oxide superconductors. The highest reported value for non-copper-oxide bulk superconductivity is Tc = 39 K in MgB2 (ref. 2). The layered rare-earth metal oxypnictides LnOFeAs (where Ln is La–Nd, Sm and Gd) are now attracting attention following the discovery of superconductivity at 26 K in the iron-based LaO1-xFxFeAs (ref. 3). Here we report the discovery of bulk superconductivity in the related compound SmFeAsO1-xFx, which has a ZrCuSiAs-type structure. Resistivity and magnetization measurements reveal a transition temperature as high as 43 K. This provides a new material base for studying the origin of high-temperature superconductivity.Since the discovery of high-transition temperature (

Nodeless superconducting gap in AxFe2Se2 (A=K,Cs) revealed by angle-resolved photoemission spectroscopy

T_c

Different resistivity response to spin-density wave and superconductivity at 20?K in Ca1?xNaxFe2As2

) superconductivity in layered copper oxides, extensive efforts have been devoted to explore the higher

Coexistence of the spin-density wave and superconductivity in Ba1―xKxFe2As2

T_c

Superconductivity at 32 K in single-crystalline RbxFe2−ySe2

superconductivity. However, the

A BCS-like gap in the superconductor SmFeAsO0.85F0.15

T_c

Anisotropy in the electrical resistivity and susceptibility of superconducting BaFe2As2 single crystals.

higher than 40 K can be obtained only in the copper oxide superconductors so far. The highest reported value of

Common Crystalline and Magnetic Structure of Superconducting A2Fe4Se5 (A=K,Rb,Cs,Tl) Single Crystals Measured Using Neutron Diffraction

T_c

Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe2As2

for non-copper-oxide bulk superconductivity is 39 K in

Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe

MgB_2