Superconductivity at 43 K in an iron-based layered compound LaO1-xFxFeAs

  title={Superconductivity at 43 K in an iron-based layered compound LaO1-xFxFeAs},
  author={Hiroki Takahashi and Kazumi Igawa and Kazunobu Arii and Yoichi Kamihara and Masahiro Hirano and Hideo Hosono},
The iron- and nickel-based layered compounds LaOFeP (refs 1, 2) and LaONiP (ref. 3) have recently been reported to exhibit low-temperature superconducting phases with transition temperatures Tc of 3 and 5 K, respectively. Furthermore, a large increase in the midpoint Tc of up to ∼26 K has been realized in the isocrystalline compound LaOFeAs on doping of fluoride ions at the O2- sites (LaO1-xFxFeAs). Experimental observations and theoretical studies suggest that these transitions are related to… Expand
Electromagnetic properties and electronic structure of the iron-based layered superconductor LaFePO
Structural, electronic, and magnetic properties of undoped and aliovalent-ion (Ca, F)-doped LaOFeP, which undergo superconducting transitions at transition temperatures (Tc) 4-7 K [Kamihara et al, J.Expand
Superconductivity in the PbO-type structure α-FeSe
  • F. Hsu, J. Luo, +8 authors Maw-Kuen Wu
  • Materials Science, Medicine
  • Proceedings of the National Academy of Sciences
  • 2008
The observation of superconductivity with zero-resistance transition temperature at 8 K in the PbO-type α-FeSe compound is reported, indicating that this compound has the same, perhaps simpler, planar crystal sublattice as the layered oxypnictides. Expand
FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe2As2
The recently discovered FeAs-based superconductors are a new, promising set of materials for technological and basic research. They offer transition temperatures as high as 55 K as well asExpand
High Upper Critical Field in Potassium Fluoride Doped LaOFeAs Superconductor
We report a new methodology for synthesizing oxypnictide superconductors with the commonly available potassium fluoride (KF) as a source of fluorine instead of expensive LaF3. This results inExpand
Research and Prospects of Iron‐Based Superconductors
The discovery of a new superconductor, LaFeAsO(1-x)F(x) with a superconducting critical temperature,T(c), of 26 K in 2008, has quickly renewed interest in the exploration of iron-basedExpand
High-pressure studies on Tc and crystal structure of iron chalcogenide superconductors
In the case of Fe(Se1−xTex), the maximum Tc under high pressure did not exceed the Tc of FeSe, which can be attributed to the structural transition to the monoclinic phase, which may be due to the disorder induced by substituting S for Se, similar to the pressure effect on Tc for the 1111-type superconductor Ca(Fe 1−xCox)AsF. Expand
Potassium fluoride doped LaOFeAs multi-band superconductor: Evidence of extremely high upper critical field
The recently discovered superconductors based on oxypnictides have rekindled the search for new non-copper based high-Tc superconductors. After the initial report by Kamihara et al. ofExpand
Superconductivity at 52 K in hydrogen-substituted LaFeAsO1-xHx under high pressure
The present findings strongly suggest that the main reason for realization of the Tc >50 K observed in RE-1111 compounds (RE: Pr, Sm, and Gd) at ambient pressure is the merging of SC1 and SC2. Expand
La-Substituted CaFeAsH Superconductor with Tc = 47 K
La-substituted CaFeAsH, (Ca1−xLax)FeAsH, were synthesized by the solid state reaction at 1173 K under high pressure of 2.5 GPa. The ρ–T anomaly corresponding to tetragonal to orthorhombic structuralExpand
Interplay of superconductivity and d—f correlation in CeFeAs1−xPxO1−yFy
The recent discovery of high-temperature superconductivity in iron-based pnictides (chalcogenides) not only triggers tremendous enthusiasm in searching for new superconducting materials, but alsoExpand


Superconductivity in a layered perovskite without copper
FOLLOWING the discovery of superconductivity at ∼30 K in La2−xBaxCuO4 (ref. 1), a large number of related compounds have been found that are superconducting at relatively high temperatures. TheExpand
Spin dynamics in iron-based layered superconductor (La0.87Ca0.13)FePO revealed by 31P and 139La NMR studies.
From 1/T1T of 31P and 139La NMR studies of (La0.87Ca0.13)FePO, a quasi-two- dimensional electronic structure is suggested, in which the FeP layer is more conductive than the LaO layer, suggesting that novel low-energy spin dynamics develop in the SC state. Expand
Synthesis and structural characterization of LaOFeP superconductors
High quality LaOFeP superconducting materials?have been successfully synthesized by a two-step solid reaction method. We first prepared a La?Fe?P ternary alloy following a pre-alloying treatment; theExpand
Spin-triplet superconductivity in Sr2RuO4 identified by 17O Knight shift
Superconductivity — one of the best understood many-body problems in physics — has again become a challenge following the discovery of unconventional superconducting materials: these includeExpand
Ferromagnetic spin fluctuation in LaFeAsO 1 − x F x
The F doped LaFeAsO, a recently discovered superconductor with the high Tc of 26 K, has been studied by the resistivity, magnetic susceptibility, and heat capacity measurements in the F doping rangeExpand
Iron-based layered superconductor La[O(1-x)F(x)]FeAs (x = 0.05-0.12) with T(c) = 26 K.
It is reported that a layered iron-based compound LaOFeAs undergoes superconducting transition under doping with F- ions at the O2- site and exhibits a trapezoid shape dependence on the F- content. Expand
Superconductivity in the Ladder Material Sr0.4Ca13.6Cu24O41.84
We have observed superconductivity in the ladder material Sr 0.4 Ca 13.6 Cu 24 O 41.84 under pressures of 3 GPa and 4.5 GPa by means of electrical measurements. The superconducting transitionExpand
Iron-based layered superconductor: LaOFeP.
Magnetic and electrical resistivity measurements verify the occurrence of the superconducting transition at approximately 4 K in an iron-based layered oxy-pnictide LaOFeP. Expand
Density functional study of LaFeAsO(1-x)F(x): a low carrier density superconductor near itinerant magnetism.
LaFeAs(O,F) is in a unique class of high T(c) superconductors: high N(E(F))) ionic metals near magnetism. Expand
Superconductivity in the non-magnetic state of iron under pressure
It is reported that iron does indeed become superconducting at temperatures below 2 K at pressures between 15 and 30 GPa and the transition to the superconductor state is confirmed by both a drop in resistivity and observation of the Meissner effect. Expand