ChemInform Abstract: New‐Structure‐Type Fe‐Based Superconductors: CaAFe4As4 (A: K, Rb, Cs) and SrAFe4As4 (A: Rb, Cs).

Iyo, A.; Kawashima, Kenji; Kinjo, Tadatsugu; Nishio, Toshiyuki; Ishida, Shigeyuki; Fujihisa, Hiroshi; Gotoh, Yoshito; Kihou, Kunihiro; Eisaki, H.; Yoshida, Yoshiyuki

doi:10.1002/chin.201626018

Cited by 14 publications

(47 citation statements)

References 1 publication

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“…1322−24 In general, the formation of any ordered AEuFe 4 As 4 (A = Rb, Cs) phase requires an ab plane lattice match between AFe 2 As 2 and EuFe 2 As 2 , as well as a large ionic difference between A + and Eu 2+ ions. 25 RbEuFe 4 As 4 can be described as an intergrowth structure of RbFe 2 As 2 and EuFe 2 As 2 such that the Eu atoms end up forming a primitive tetragonal lattice running parallel to the caxis instead of being body-centered, as in EuFe 2 As 2 or EuFe 2 P 2 . Figure 4 illustrates the crystal structure of RbEuFe 4 As 4−x P x , which is isostructural to RbEuFe 4 As 4 with its unit cell consisting of stacked Fe(As/P) 4 layers sandwiched by layers of Eu 2+ and Rb + cations that alternate along the c-axis.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Probing Phosphorus Solubility and Its Effect on Critical Temperature (T_c) in the Helical Superconducting Magnet RbEuFe₄As_4–xP_x

Usman,

Zhou,

Malliakas

et al. 2023

Chem. Mater.

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RbEuFe 4 As 4 exhibits a rare combination of hightemperature superconductivity and noncollinear magnetism, originating from the FeAs and Eu layers, respectively. In order to fine-tune its superconducting and magnetic properties, we studied P-doped RbEuFe 4 As 4−x P x . To determine the value of x for which RbEuFe 4 As 4−x P x exists, members of the series have been synthesized in the form of relatively large-sized single crystals by a high-temperature flux growth technique using RbAs flux as well as polycrystalline powder by direct combination reactions between RbFe 2 As 2 and EuFe 2 As 2−x P x . The flux crystal growth reactions indicate that RbEuFe 4 As 4−x P x forms with the values of x ≤ 0.12, which is corroborated by the Rietveld refinement analysis on the products obtained from direct combination reactions. The solubility limit exists primarily due to the preferential site As(2) occupation by P in the RbEuFe 4 As 4 crystal structure. As x increases in RbEuFe 4 As 4−x P x , magnetization measurements reveal that the superconducting critical transition temperature (T c ) decreases, while the magnetic ordering temperature (T N ) remains almost unchanged in comparison to undoped RbEuFe 4 As 4 .

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Probing Phosphorus Solubility and Its Effect on Critical Temperature (T_c) in the Helical Superconducting Magnet RbEuFe₄As_4–xP_x

Usman,

Zhou,

Malliakas

et al. 2023

Chem. Mater.

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“…Prior research 51 presented an idea that T c increases when the FeAs 4 tetrahedron is transformed toward an ideal tetrahedron with the As−Fe−As bond angle tending toward 109.47°. To confirm the relationship between the As−Fe−As bond angles and superconductivity, we show the values with the As−Fe−As bond angles of SmFFeAs and other undoped iron-based compounds in Figure 6 (data are taken from the literature 1,11,12,[21][22][23][24][25][26][27][30][31][32]44,46,52 ). It turned out that the angles of the compounds exhibiting higher T c values are mostly distributed around 109.47°(see Figures S5 and S6 in the Supporting Information).…”

Section: Inorganic Chemistrymentioning

confidence: 99%

A Self-Doped Oxygen-Free High-Critical-Temperature (High-T_c) Superconductor: SmFFeAs

Lin

Luo

et al. 2019

Inorg. Chem.

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A new iron-base superconductor SmFFeAs is synthesized via solid-state metathesis reaction by using SmFCl and LiFeAs as precursors. The compound crystallized in the tetragonal ZrCuSiAs-type structure with the space group P4/nmm and lattice parameters of a = 3.9399(0) Å and c = 8.5034(1) Å. The superconducting diamagnetic transition occurs at 56 K for the parent compound, which confirmed by the resistivity and magnetic susceptibility. The appearance of superconductivity without extrinsic doping could be ascribed to the self-doping owing to the mixed valence of Sm ions. The as-synthesized SmFFeAs serves as a new self-doped parent compound for oxygen-free high-critical-temperature (high-T c) superconductors.

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“…11−14 On the contrary, the newly identified 1144 family, with the CaKFe 4 As 4 representative, features an ordered arrangement of monovalent and divalent cations, lacks an orthorhombic distortion, and exhibits inherent superconductivity. 15,16 Another interesting aspect of layered compounds is that their structure is prone to deintercalation. Hence, these layered compounds can yield new metastable compounds via cation deintercalation from the parent layered structure followed by condensation of the anionic layers.…”

Section: ■ Introductionmentioning

confidence: 99%

From Layered Antiferromagnet to 3D Ferromagnet: LiMnBi-to-MnBi Magneto-Structural Transformation

et al. 2023

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The intermetallic compound LiMnBi was synthesized by the two-step solid-state reaction from the elements. A synthesis temperature of 850 K was selected based on in situ high-temperature powder X-ray diffraction data. LiMnBi crystalizes in the layered-like PbClF structure type (a = 4.3131(7) Å, c = 7.096(1) Å at 100 K, P4/nmm space group, Z = 2). The LiMnBi structure is built of alternating [MnBi] and Li layers, as determined from single-crystal X-ray diffraction data. Magnetic property measurements and solid-state 7Li nuclear magnetic resonance data collected for polycrystalline LiMnBi samples indicate the long-range antiferromagnetic ordering of the Mn sublattice at ∼340 K, with no superconductivity detected down to 5 K. LiMnBi is air- and water-sensitive. Under aerobic conditions, Li can be extracted from the LiMnBi structure to form Li2O/LiOH and MnBi (NiAs structure type, P63/mmc). The obtained MnBi polymorph was previously reported to be one of the strongest rare-earth-free ferromagnets, yet its bulk synthesis in powder form is cumbersome. The proposed magneto-structural transformation from ternary LiMnBi to ferromagnetic MnBi involves condensation of the MnBi4 tetrahedra upon Li deintercalation and is exclusive to LiMnBi. In contrast, ferromagnetic MnBi cannot be obtained from either isostructural NaMnBi and KMnBi or from the structurally related CaMn2Bi2. Such a distinctive transformation in the case of LiMnBi is presumed to be due to its fitting reactivity to yield MnBi and a favorable interlayer distance between [MnBi] layers, while the interlayer distance in NaMnBi and KMnBi structural analogues is unfavorably long. The studies of delithiation from layered-like LiMnBi under different chemical environments indicate that the yield of MnBi depends on the type of solvent used and the kinetics of the reaction. A slow rate and mild reaction media lead to a high fraction of the MnBi product. The saturation magnetization of the “as-prepared” MnBi is ∼50% of the expected value of 81.3 emu/g. Overall, this study adds a missing member to the family of ternary pnictides and illustrates how soft-chemistry methods can be used to obtain “difficult-to-synthesize” compounds.

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ChemInform Abstract: New‐Structure‐Type Fe‐Based Superconductors: CaAFe₄As₄ (A: K, Rb, Cs) and SrAFe₄As₄ (A: Rb, Cs).

Abstract: CaMFe4As4 (M: K, Rb, Cs) and SrMFe4As4 (M: Rb, Cs) are prepared by solid state reaction of stoichiometric amounts of the elements (stainless steel pipe, 860—920 °C, 2—6 h).

Cited by 14 publications

References 1 publication

Probing Phosphorus Solubility and Its Effect on Critical Temperature (T_c) in the Helical Superconducting Magnet RbEuFe₄As_4–xP_x

Probing Phosphorus Solubility and Its Effect on Critical Temperature (T_c) in the Helical Superconducting Magnet RbEuFe₄As_4–xP_x

A Self-Doped Oxygen-Free High-Critical-Temperature (High-T_c) Superconductor: SmFFeAs

From Layered Antiferromagnet to 3D Ferromagnet: LiMnBi-to-MnBi Magneto-Structural Transformation

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ChemInform Abstract: New‐Structure‐Type Fe‐Based Superconductors: CaAFe4As4 (A: K, Rb, Cs) and SrAFe4As4 (A: Rb, Cs).

Abstract: CaMFe4As4 (M: K, Rb, Cs) and SrMFe4As4 (M: Rb, Cs) are prepared by solid state reaction of stoichiometric amounts of the elements (stainless steel pipe, 860—920 °C, 2—6 h).

Cited by 14 publications

References 1 publication

Probing Phosphorus Solubility and Its Effect on Critical Temperature (Tc) in the Helical Superconducting Magnet RbEuFe4As4–xPx

Probing Phosphorus Solubility and Its Effect on Critical Temperature (Tc) in the Helical Superconducting Magnet RbEuFe4As4–xPx

A Self-Doped Oxygen-Free High-Critical-Temperature (High-Tc) Superconductor: SmFFeAs

From Layered Antiferromagnet to 3D Ferromagnet: LiMnBi-to-MnBi Magneto-Structural Transformation

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Product

Resources

About

ChemInform Abstract: New‐Structure‐Type Fe‐Based Superconductors: CaAFe₄As₄ (A: K, Rb, Cs) and SrAFe₄As₄ (A: Rb, Cs).

Probing Phosphorus Solubility and Its Effect on Critical Temperature (T_c) in the Helical Superconducting Magnet RbEuFe₄As_4–xP_x

Probing Phosphorus Solubility and Its Effect on Critical Temperature (T_c) in the Helical Superconducting Magnet RbEuFe₄As_4–xP_x

A Self-Doped Oxygen-Free High-Critical-Temperature (High-T_c) Superconductor: SmFFeAs