Superconductivity in the PbO-type Structure alpha-FeSe

Abstract

The recent discovery of superconductivity with relatively high transition temperature Tc in the layered iron-based quaternary oxypnictides La[ O1-xFx] FeAs was a real surprise. The excitement generated can be seen by the number of subsequent works published within a very short period of time. Although there exists superconductivity in alloy that contains Fe element, LaOMPn (with M= Fe, Ni; and Pn=P and As) is the first system where Fe-element plays the key role to the occurrence of superconductivity. LaOMPn has a layered crystal structure with an Fe-based plane. It is quite natural to ask whether there exists other Fe based planar compounds that exhibit superconductivity. Here we report the observation of superconductivity with zero resistance transition temperature at 8K in the PbO-type alpha-FeSe compound. Although FeSe has been studied quite extensively, a key observation is that the clean superconducting phase exists only in those samples prepared with intentional Se deficiency. What is truly striking, is that this compound has the same, perhaps simpler, planar crystal sublattice as the layered oxypnictides. Furthermore, FeSe is, compared with LaOFeAs, much easier to handle and fabricate. In view of the abundance of compounds with PbO type structure, this result opens a new route to the search for unconventional superconductors.

PDF format, 10 pages, 5 figures

Cited by in corpus (25)

• Superconductivity at 27 K in tetragonal FeSe under high pressure
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
• Structure determination and coexistence of superconductivity and antiferromagnetic order in (Li0.8Fe0.2)OHFeSe
• Orbital-driven nematicity in FeSe
• Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
• Phonon-enhanced superconductivity at the FeSe/SrTiO3 interface
• Electric field-induced superconducting transition of insulating FeSe thin film at 35 K
• Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe${}_{1-x}$Te${}_x$ thin films
• Fe-vacancy order and superconductivity in PbO-type tetragonal β-Fe1-xSe
• Artificially engineered superlattices of pnictide superconductor
• The role of double TiO2 layers at the interface of FeSe/SrTiO3 superconductors
• What Tc Tells
• Emergence of magnetism and controlling factors of superconductivity in Li/Na-ammonia co-intercalated FeSe1-zTez
• Structural, magnetic, and electronic evolution of the spin-ladder system BaFe${}_2$S${}_{3-x}$Se${}_x$ with isoelectronic substitution
• Role of the Extra-Fe in K2-xFe4+ySe5 superconductors
• Neutron scattering patterns show Superconductivity in FeTe0.5Se0.5 likely results from itinerant electron fluctuations
• X-ray absorption spectroscopy measurement on the LaO1-xFxFeAs system
• Band structure of (Sr3Sc2O5)Fe2As2 as a possible parent phase for new FeAs superconductors
• Unconventional superconductivity originating from disconnected Fermi surfaces in the iron-based compound
• The Future of the Correlated Electron Problem
• Synthesis, Crystal Growth and Epitaxial Layer Deposition of FeSe0.88 Superconductor and Other Poison Materials by Use of High Gas Pressure Trap System
• Superconductivity in layered iron Selenide induced by cobalt- and sodium-doping
• Pressure effect on superconductivity and magnetism in FeSex
• Isovalent substitution effects of arsenic on structural and electrical properties of iron-based superconductor NdFeAsO0.8F0.2