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Electrochemical synthesis and crystal structure of the organic ion intercalated superconductor (TMA)0.5Fe2Se2 with Tc = 43 K
Bettina Rendenbach, Timotheus Hohl, Sascha Harm +2
Intercalation of organic cations in superconducting iron selenide can significantly increase the critical temperature (Tc). We present an electrochemical method using beta-FeSe cry…
Muon spin rotation measurements on RbEuFeAs under pressure
S. Holenstein, B. Fischer, Y. Liu +13
We report muon spin rotation and magnetization measurements on the magnetic superconductor RbEuFeAs under hydrostatic pressures up to 3.8 GPa. At ambient pressure, RbEu…
Coupled Magnetic and Superconducting Transitions in SrVOFeAs Under Pressure
S. Holenstein, F. Hummel, Z. Guguchia +11
We report muon spin rotation (SR) and magnetization measurements on superconducting SrVOFeAs under pressure. At ambient pressure, SrVOFeAs undergoes an a…
Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSeS
S. Holenstein, J. Stahl, Z. Shermadini +10
We report muon spin rotation (SR) and magnetization measurements under pressure on FeSeS with x .Above GPa…
FeSe(en)0.3 - Separated FeSe layers with stripe-type crystal structure by intercalation of neutral spacer molecules
Juliane Stahl, Dirk Johrendt
Solvothermal intercalation of ethylenediamine molecules into FeSe separates the layers by 1078 pm and creates a different stacking. FeSe(en)0.3 is not superconducting although each…
Coexistence of low moment magnetism and superconductivity in tetragonal FeS and suppression of under pressure
S. Holenstein, U. Pachmayr, Z. Guguchia +8
We report local probe (SR) measurements on the recently discovered tetragonal FeS superconductor which has been predicted to be electronically very similar to superconducting Fe…
Role of heat and mechanical treatments in the fabrication of superconducting Ba0.6K0.4Fe2As2 ex-situ Powder-In-Tube tapes
A. Malagoli, E. Wiesenmayer, S. Marchner +3
Among the recently discovered Fe-based superconducting compounds, the (K,Ba)Fe2As2 phase is attracting large interest within the scientific community interested in conductor develo…
Oxygen-annealing effects on superconductivity in polycrystalline Fe1-xTe1-ySey
Gina M. Friederichs, Matthias P. B. Wörsching, Dirk Johrendt
Superconductivity in anti-PbO-type iron chalcogenides Fe1-xTe1-ySey (x = 0, 0.1, y = 0.1 0.4) depends on the amount (x) of interstitial iron atoms located between the FeTe1-ySey la…
Microscopic coexistence of superconductivity and magnetism in Ca1-xNaxFe2As2
Philipp Materne, Sirko Kamusella, Rajib Sarkar +9
We present a detailed investigation of the magnetic and superconducting properties of Ca1-xNaxFe2As2 single crystals with x = 0.00, 0.35, 0.50, and 0.67 by means of the local probe…
Coexistence of 3d-ferromagnetism and superconductivity in [(Li(1-x)Fex)OH](Fe(1-y)Liy)Se
Ursula Pachmayr, Fabian Nitsche, Hubertus Luetkens +5
Superconducting [(Li(1-x)Fex)OH](Fe(1-y)Liy)Se (x ~ 0.2, y ~ 0.08) was synthesized by hydrothermal methods and structurally characterized by single crystal X-ray diffraction. The c…
Superconductivity by transition metal doping in Ca(FeMAs)(PtAs) (M = Co, Ni, Cu)
Tobias Stürzer, Fabian Kessler, Dirk Johrendt
We report the successful substitution of cobalt, nickel, and copper for iron in the 1038 phase parent compound Ca(FeAs)(PtAs) yielding Ca(FeCo$…
Superconductivity by rare earth doping in the 1038-type compounds (CaRE)(FeAs)(PtAs) with RE = Y, La-Nd, Sm-Lu
Tobias Stürzer, Gerald Derondeau, Dirk Johrendt
We report superconductivity in polycrystalline samples of the 1038-type compounds (CaRE)(FeAs)(PtAs) up to T = 35 K with RE = Y, La-Nd, Sm, Gd…
Microscopic Coexistence of Magnetism and Superconductivity in charge compensated Ba1-xKx(Fe1-yCoy)2As2
Til Goltz, Veronika Zinth, Dirk Johrendt +5
We present a detailed investigation of the electronic phase diagram of effectively charge compensated Ba1-xKx(Fe1-yCoy)2As2 with x/2 = y. Our experimental study by means of x-ray d…
Multigap superconductivity in locally non-centrosymmetric SrPtAs: An As nuclear quadrupole resonance investigation
F. Brückner, R. Sarkar, M. Günther +9
We report detailed As-NQR investigations of the locally non-centrosymmetric superconductor SrPtAs. The spin-lattice relaxation studies prove weakly coupled multi-gap superco…
Superconductivity in Ba1-xKxTi2Sb2O (0 < x < 1) controlled by charge doping
Ursula Pachmayr, Dirk Johrendt
The solid solution of antimonide-oxides Ba1-xKxTi2Sb2O (0 < x < 1) has been synthesized by solid-state reactions and characterized by X-ray powder diffraction (CeCr2Si2C-type struc…
Weak magnetism and the Mott-state of vanadium in superconducting Sr2VO3FeAs
Franziska Hummel, Yixi Su, Anatoliy Senyshyn +1
We report neutron scattering data and DFT calculations of the stoichiometric iron-arsenide superconductor Sr2VO3FeAs. Rietveld refinements of neutron powder patterns confirm the id…
Short range magnetic order and effective suppression of superconductivity by manganese-doping in LaFe1-xMnxAsO1-yFy
Rainer Frankovsky, Hubertus Luetkens, Frank Tambornino +5
We present a study of the structural and physical properties of directly hole doped LaFe1-xMnxAsO (x = 0.0-0.2) and the influence of charge compensation / electron-doping by additi…
Evidence for Time-Reversal-Symmetry-Broken Superconductivity in Locally Noncentrosymmetric SrPtAs
P. K. Biswas, H. Luetkens, T. Neupert +16
We report the magnetic and superconducting properties of locally noncentrosymmetric SrPtAs obtained by muon-spin-rotation/relaxation (muSR) measurements. Zero-field muSR reveals th…
The role of different negatively charged layers in Ca10(Fe1-xPtxAs)10(Pt3+yAs8) and superconductivity at 30 K in electron-doped (Ca0.8La0.2)10(FeAs)10(Pt3As8)
Tobias Stürzer, Gerald Derondeau, Dirk Johrendt
The recently discovered compounds Ca10(Fe1-xPtxAs)10(Pt3+yAs8) exhibit superconductivity up to 38 K, and contain iron arsenide (FeAs) and platinum arsenide (Pt3+yAs8) layers separa…
The interplay of electron doping and chemical pressure in Ba(Fe(1-y)Coy)2(As(1-x)Px)2
Veronika Zinth, Dirk Johrendt
The effects of internal chemical pressure on electron doped iron arsenide superconductors are studied in the series Ba(Fe(1-y)Coy)2(As(1-x)Px)2. Combinations of both dopants induce…
Superconductivity up to 35 K in the iron-platinum arsenides (CaFe1-xPtxAs)10Pt4-yAs8 with layered structures
Catrin Löhnert, Tobias Stürzer, Marcus Tegel +3
We report the synthesis and crystal structures of three new superconducting iron-platinum arsenides (CaFe1-xPtxAs)10Pt4-yAs8 (x = 0-0.15, y = 0-0.4). The structures are stacking va…
Suppression of superconductivity by V-doping and possible magnetic order in Sr2VO3FeAs
Marcus Tegel, Tanja Schmid, Tobias Stürzer +4
Superconductivity at 33 K in Sr2VO3FeAs is completely suppressed by small amounts of V-doping in Sr2VO3[Fe0.93(+/-0.01)V0.07(+/-0.01)]As. The crystal structures and exact stoichiom…
Different response of the crystal structure to isoelectronic doping in BaFe2[As(1-x)P(x)]2 and [Ba(1-x)Sr(x)]Fe2As2
Marianne Rotter, Christine Hieke, Dirk Johrendt
Superconductivity up to 30 K in charge neutrally doped BaFe2[As(1-x)P(x)]2 has been ascribed to chemical pressure, caused by the shrinking unit cell. But the latter induces no supe…
The crystal structure of FeSe0.44Te0.56
Marcus Tegel, Catrin Loehnert, Dirk Johrendt
The crystal structure of the superconductor FeSe0.44Te0.56 was redetermined by high-resolution X-ray single crystal diffraction at 173 K (anti-PbO-type, P4/nmm, a=3.7996(2), c=5.98…