New Li-Ethylenediamine-Intercalated Superconductor Li$_x$(C$_2$H$_8$N$_2$)$_y$Fe$_{2-z}$Se$_2$ with $T_c$ = 45 K

@article{Hatakeda2013NewLS,
  title={New Li-Ethylenediamine-Intercalated Superconductor Li\$\_x\$(C\$\_2\$H\$\_8\$N\$\_2\$)\$\_y\$Fe\$\_\{2-z\}\$Se\$\_2\$ with \$T\_c\$ = 45 K},
  author={Takehiro Hatakeda and Takashi Noji and Takayuki Kawamata and Masatsune Kato and Yōji Koike},
  journal={arXiv: Superconductivity},
  year={2013}
}
A new iron-based superconductor Li$_x$(C$_2$H$_8$N$_2$)$_y$Fe$_{2-z}$Se$_2$ with $T_c$ = 45 K has successfully been synthesized via intercalation of dissolved lithium metal in ethylenediamine. The distance between neighboring Fe layers is 10.37 {\AA} and much larger than those of FeSe with $T_c$ = 8 K and K$_x$Fe$_2$Se$_2$ with $T_c$ ~ 30 K. It seems that the high-$T_c$ of Li$_x$(C$_2$H$_8$N$_2$)$_y$Fe$_{2-z}$Se$_2$ is caused by the possible two-dimensional electronic structure due to the large… 

New Alkali-Metal- and 2-Phenethylamine-Intercalated Superconductors $A_x$(C$_8$H$_{11}$N)$_y$Fe$_{1-z}$Se ($A$ = Li, Na) with the Largest Interlayer Spacings and $T_\mathrm{c}$ $\sim$ 40 K

New FeSe-based intercalation superconductors, $A_x$(C$_8$H$_{11}$N)$_y$Fe$_{1-z}$Se ($A$ = Li, Na), with $T_\mathrm{c}$ = 39-44 K have been successfully synthesized via the intercalation of alkali

Superconductivity and Intercalation Statein the Lithium-Hexamethylenediamine-Intercalated Superconductor Li$_x$(C$_6$H$_{16}$N$_2$)$_y$Fe$_{2-z}$Se$_2$: Dependence on the Intercalation Temperature and Lithium Content

The superconductivity and intercalation statein the lithium-and hexamethylenediamine (HMDA)-intercalated superconductor Li$_x$(C$_6$H$_{16}$N$_2$)$_y$Fe$_{2-z}$Se$_2$ have been investigated from

Superconductivity in potassium and ammonia co-intercalated FeSe1-xTex

The origin of the ~40 and ~30 K superconducting phases in the metal-intercalated FeSe superconductors is still unclear. We report the synthesis of K0:3(NH3)y(FeSe1−xTex)2 and K0:6(NH3)y(FeSe1−xTex)2

Coexistence of 3d-ferromagnetism and superconductivity in [(Li1-x Fex )OH](Fe1-y Liy )Se.

Electrical resistivity and magnetic susceptibility measurements reveal superconductivity at 43 K, and isothermal magnetization measurements confirm the superposition of ferromagnetic and superconducting hysteresis.

Superconductivity in alkali metal intercalated iron selenides

The present paper reviews scientific work concerning methods of synthesis and crystal growth, structural and superconducting properties as well as pressure investigations, and assumes the iron vacancy ordering, linked with a long-range magnetic order and a mesoscopic phase separation, to be an intrinsic property of the system.

A FeSe-based superconductor (C2H8N2)xFeSe with only ethylenediamine intercalated

A new FeSe-based superconductor (C2H8N2)x FeSe with ethylenediamine intercalated into FeSe was successfully synthesized by the solvothermal method, which is the first superconducting instance by

Kx(C2H8N2)yFe2−zS2: synthesis, phase structure and correlation between K+ intercalation and Fe depletion

We report a new layered FeS compound Kx(C2H8N2)yFe2−zS2 synthesized by intercalating K and C2H8N2 into tetragonal FeS via a simple sonochemical route. This new compound crystallizes in a

Emergence of double-dome superconductivity in ammoniated metal-doped FeSe

The observation of a double-domesuperconducting phase may provide a hint for pursuing the superconducting coupling-mechanism of ammoniated/non-ammoniated metal-doped FeSe.

Intercalant dependence of superconductivity in Ax(NH3)yFe2-δSe2 single crystals

Metal intercalation using a solvent has produced significant advances in the development of Fe-chalcogenide superconducting materials. Recently, the superconducting transition temperature (TC) of

References

SHOWING 1-10 OF 10 REFERENCES

Superconductivity in the PbO-type structure α-FeSe

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.

Synthesis of a new alkali metal-organic solvent intercalated iron selenide superconductor with Tc ≈ 45 K.

The findings indicate a new synthesis route leading to possibly even higher critical temperatures for materials in this class: by intercalation of organic compounds between Fe-Se layers.

Enhancement of the superconducting transition temperature of FeSe by intercalation of a molecular spacer layer.

The synthesis of Li(x)( NH(2))(y)(NH(3))(1-y)Fe(2)Se(2), with lithium ions, lithium amide and ammonia acting as the spacer layer between FeSe layers, which exhibits superconductivity at 43(1) K, higher than in any FeSe-derived compound reported so far.

Observation of superconductivity at 30∼46K in AxFe2Se2 (A = Li, Na, Ba, Sr, Ca, Yb, and Eu)

It is demonstrated that a series of superconductors with enhanced Tc = 30∼46 K can be obtained by intercalating metals, Li, Na, Ba, Sr, Ca, Yb, and Eu in between FeSe layers by the ammonothermal method at room temperature, providing a new starting point for studying the properties of thesesuperconductors and an effective synthetic route for the exploration of new superconductor exploration.

Superconductivity at Tc = 44 K in LixFe2Se2(NH3)y

Following a recent proposal by Burrard-Lucas et al. [arXiv:1203.5046] we intercalated FeSe with Li in liquid ammonia. We report on the synthesis of new LixFe2Se2(NH3)y phases as well as on their

Superconductivity in the iron selenide K x Fe 2 Se 2 (0≤x≤1.0)

We report the superconductivity at above 30 K in a FeSe-layer compound K0.8Fe2Se2 (nominal composition) achieved by metal K intercalating in between FeSe layers. It is isostructural to BaFe2As2 and

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.

Three-Dimensional Visualization in Powder Diffraction

A new three-dimensional visualization system, VESTA, is developed, using wxWidgets as a C++ application framework, which excels in visualization, rendering, and manipulation of crystal structures and electron/nuclear densities determined by X-ray/ neutron diffraction and electronic-structure calculations.