Iron based chalcogenide and pnictide superconductors: From discovery to chemical ways forward

Rasaki, Sefiu Abolaji; Thomas, Tiju; Yang, Minghui

doi:10.1016/j.progsolidstchem.2020.100282

Cited by 5 publications

(4 citation statements)

References 178 publications

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“…The question of whether some specific crystal structure and bonding situation can facilitate superconducting pairing has intrigued chemists since shortly after the discovery of superconductivity. − Hence, the connection between the superconducting critical temperature ( T c ) and aspects of the crystal structure is crucial yet poorly understood in all superconductors. This applies in particular for Fe- and Cu-based high- T c superconductors; the former also feature an electronic nematic coupled with a structural orthorhombic transition ( T s ) above T c . − Fe superconductor materials crystallize in different space groups but share a common local structure feature, tetrahedrally coordinated Fe atoms. − One important empirical discovery for the future of materials design is that in most Fe-based superconductors the maximal T c correlates with the average anion height above the Fe plane; the height depends on the geometry of the FeAs 4 or FeCh 4 (Ch = Te, Se, or S) tetrahedron . The geometry also regulates the correlation strength due to average Fe–As(Ch) hybridization, pointing to a spin fluctuation mechanism of pairing that governs the magnitude of T c . , …”

Section: Introductionmentioning

confidence: 99%

Suppression of Superconductivity and Nematic Order in Fe_1–ySe_1–xS_x (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder

et al. 2022

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Connections between crystal chemistry and critical temperature T c have been in the focus of superconductivity, one of the most widely studied phenomena in physics, chemistry, and materials science alike. In most Fe-based superconductors, materials chemistry and physics conspire so that T c correlates with the average anion height above the Fe plane, i.e., with the geometry of the FeAs 4 or FeCh 4 (Ch = Te, Se, or S) tetrahedron. By synthesizing Fe 1−y Se 1−x S x (0 ≤ x ≤ 1; y ≤ 0.1), we find that in alloyed crystals T c is not correlated with the anion height like it is for most other Fe superconductors. Instead, changes in T c (x) and tetragonal-to-orthorhombic (nematic) transition T s (x) upon cooling are correlated with disorder in Fe vibrations in the direction orthogonal to Fe planes, along the crystallographic c-axis. The disorder stems from the random nature of S substitution, causing deformed Fe(Se,S) 4 tetrahedra with different Fe−Se and Fe−S bond distances. Our results provide evidence of T c and T s suppression by disorder in anion height. The connection to local crystal chemistry may be exploited in computational prediction of new superconducting materials with FeSe/S building blocks.

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Section: Introductionmentioning

confidence: 99%

Suppression of Superconductivity and Nematic Order in Fe_1–ySe_1–xS_x (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder

et al. 2022

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“…[15] Iron selenide nanowires are also obtained by annealing of pulsed laser deposited iron selenide thin films. [16] On the other hand, measurements of the energy-dispersive Xray spectroscopy (EDS) has shown that the FF films are composed of glass (SiO:Na Bringing to the mind that the ionic radius of Yb þ2 being 116 pm [17] is much larger than that of Fe þ4 (58.5 pm) [18] substitution of Yb in regular sites of Fe is not expected. However, as the bond length of Yb-Se (280.9 pm) is shorter than that of Yb-Yb (358.8 pm) [19] due to the stronger coulombic interactions unreacted (broken bonds) Se atoms capture Yb atoms and forms YbSe at the ultrathin interface between Yb and FeSe 2 .…”

Section: Resultsmentioning

confidence: 99%

“…[ 15 ] Iron selenide nanowires are also obtained by annealing of pulsed laser deposited iron selenide thin films. [ 16 ]…”

Section: Resultsmentioning

confidence: 99%

Iron Selenide Nanowire Bundles for Microwave Communication Technology

Qasrawi,

Toubasi

2023

Physica Status Solidi (a)

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Herein stacked layers of FeSe2 deposited onto ytterbium substrates using the thermal evaporation technique under a vacuum pressure of 10‐5 mbar are observed to form nanowire bundles (NB). Structural investigations on these NBs have shown the preferred growth of orthorhombic FeSe2 in addition to hexagonal ytterbium selenide as a minor phase in the structure of FeSe2. Impedance spectroscopy analyses conducted in the frequency domain of 0.01‐1.80 GHz shown that FeSe2 stacks can exhibit a negative capacitance effect and band stop filter characteristics. For these band stop filters, the refection coefficient (S11), the voltage standing wave ratios (VSWR) and the return loss (Lr) spectra displayed optimum values at a notch frequency of 0.87 GHz. In addition, computational analysis using Lorentz Oscillator (LO) Model has shown that the negativity of the capacitance is dominated by two oscillators centered at 0.08 GHz and 1.25 GHz. On the other hand, the insertion of aluminum nanosheets between the stacked layers of FeSe2 has been observed to decrease the negativity of the capacitance, increase the values of S11 and Lr and bring the VSWR closer to ideality. FeSe2 nanowire bundles resulting from FeSe2 stacks comprising Al nanosheets are considered suitable for microwave communication technology.This article is protected by copyright. All rights reserved.

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“…Numerous FebSc systems with various compositions and crystal structure classes are found still now. Different systems are distinguished for convenience by the stoichiometric proportions of the chemical components of their parent molecules [10,11]. The most common FebSc systems that use this nomenclature are 245, 1144, 42622, 12442, 1111, 111, 11, and [12][13][14][15][16].…”

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confidence: 99%

Theoretical study of the interplay of spin density wave and superconductivity in nickel substitution of the strontium–iron–arsenide (SrFe2−xNixAs2) superconductor in a two-band model

Bogale,

Shiferaw

2023

Front. Phys.

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The main objective of this manuscript is to focus on the computational study of the interplay of spin density wave (SDW) and superconductivity using a two-band model for SrFe2−xNixAs2. We derived mathematical statements for the superconducting critical temperature, SDW critical temperature, superconductivity order parameter, and the SDW order parameter using the Hamiltonian model and Green’s function formalism for the SrFe2−xNixAs2 superconductor. A mathematical expression for the dependence of transition temperatures on the SDW order parameter was obtained for SrFe2−xNixAs2. Using these mathematical statements, transition temperatures versus the SDW order parameter phase diagrams were plotted to show the dependence of the SDW order parameter on transition temperatures. By merging these diagrams, we have depicted the intriguing possibility of the interplay of superconductivity and magnetism for the SrFe2−xNixAs2 superconductor. Phase diagrams of temperature versus superconducting order parameters and the SDW order parameter were also plotted to show the dependence of order parameters on temperature for the SrFe2−xNixAs2 superconductor.

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Iron based chalcogenide and pnictide superconductors: From discovery to chemical ways forward

Cited by 5 publications

References 178 publications

Suppression of Superconductivity and Nematic Order in Fe_1–ySe_1–xS_x (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder

Suppression of Superconductivity and Nematic Order in Fe_1–ySe_1–xS_x (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder

Iron Selenide Nanowire Bundles for Microwave Communication Technology

Theoretical study of the interplay of spin density wave and superconductivity in nickel substitution of the strontium–iron–arsenide (SrFe2−xNixAs2) superconductor in a two-band model

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Iron based chalcogenide and pnictide superconductors: From discovery to chemical ways forward

Cited by 5 publications

References 178 publications

Suppression of Superconductivity and Nematic Order in Fe1–ySe1–xSx (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder

Suppression of Superconductivity and Nematic Order in Fe1–ySe1–xSx (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder

Iron Selenide Nanowire Bundles for Microwave Communication Technology

Theoretical study of the interplay of spin density wave and superconductivity in nickel substitution of the strontium–iron–arsenide (SrFe2−xNixAs2) superconductor in a two-band model

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Suppression of Superconductivity and Nematic Order in Fe_1–ySe_1–xS_x (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder

Suppression of Superconductivity and Nematic Order in Fe_1–ySe_1–xS_x (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder