Electrochemical synthesis and crystal structure of the organic ion intercalated superconductor (TMA)0.5Fe2Se2 with Tc = 43 K
arXiv:2012.01225 · doi:10.1021/jacs.0c13396
Abstract
Intercalation of organic cations in superconducting iron selenide can significantly increase the critical temperature (Tc). We present an electrochemical method using beta-FeSe crystals (Tc ~ 8 K) floating on a mercury cathode to intercalate tetramethylammonium ions (TMA+) quantitatively to obtain bulk samples of (TMA)0.5Fe2Se2 with Tc = 43 K. The layered crystal structure is closely related to the ThCr2Si2-type with disordered TMA+ ions between the FeSe layers. Although the organic ions are not detectable by X-ray diffraction, packing requirements as well as first principle DFT calculations constrain the specified structure. Our synthetic route enables electrochemical intercalations of other organic cations with high yields to greatly optimize the superconducting properties, and to expand this class of high-Tc materials.
21 pages, 10 Figures, including supplementary information
References in corpus (11)
- Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
- Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
- Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
- LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
- Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
- Superconductivity and Crystal Structures of (Ba1-xKx)Fe2As2 (x = 0 - 1)
- Exploration of new superconductors and functional materials and fabrication of superconducting tapes and wires of iron pnictides
- Coexistence of 3d-ferromagnetism and superconductivity in [(Li(1-x)Fex)OH](Fe(1-y)Liy)Se
- Phase relations in K_xFe_{2-y}Se_2 and the structure of superconducting K_xFe_2Se_2 via high-resolution synchrotron diffraction
- Phase diagram of (Li1-xFex)OHFeSe: a bridge between iron selenide and arsenide superconductors
- Ionic-liquid-gating induced protonation and superconductivity in FeSe, FeSe0.93S0.07, ZrNCl, 1T-TaS2, and Bi2Se3
Cited by in corpus (5)
- Protonation-induced discrete superconducting phases in bulk FeSe single crystals
- Group-9 Transition Metal Suboxides Adopting the Filled-TiNi Structure: A Class of Superconductors Exhibiting Exceptionally High Upper Critical Fields
- Enhanced Superconductivity in 2H-TaS2 Devices Through in-situ Molecular Intercalation
- Effects of Chemical Pressure on Superconductivity in Electrochemically Intercalated (TMA)yFe2(Se1-xSx)2 (TMA = Tetramethylammonium)
- Extracting intrinsic superconducting properties in intercalated layered superconductors using an extended 2D Tinkham model