The preparation and phase diagrams of (7Li1−xFexOD)FeSe and (Li1−xFexOH)FeSe superconductors

Zhou, Xiuquan; Borg, Christopher K. H.; Lynn, J. W.; Saha, Shanta; Paglione, Johnpierre; Rodriguez, Efrain E.

doi:10.1039/c5tc04041h

Cited by 34 publications

(52 citation statements)

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“…Refinements with PXRD were limited to occupation of total transition metal (M * ) doping in the hydroxide layer as well as total transition metal in the FeSe layer yielding a formula: (Li 1−x M * x OD)M y Se. Rietveld refinements of the powder x-ray diffraction yielded a composition of (Li 0.875(2) M * 0.125(2) OD)M Se with lattice parameters a = 3.8008(1)Å and c = 9.2394(2)Å which is in close agreement with previous works 3,4,11,41 .…”

Section: Hydrothermal Synthesis and Crystallographic Resultssupporting

confidence: 88%

Long-range magnetic order in hydroxide-layer-doped (Li1−x−yFexMnyOD)FeSe

Wilfong

Zhou

Zheng

et al. 2020

Phys. Rev. Materials

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The (Li1−xFexOH)FeSe superconductor has been suspected to exhibit long-range magnetic ordering due to Fe substitution in the LiOH layer. However, no direct observation such as magnetic reflection from neutron diffraction has be reported. Here, we use a chemical design strategy to manipulate the doping level of transition metals in the LiOH layer to tune the magnetic properties of the (Li1−x−yFexMnyOD)FeSe system. We find Mn doping exclusively replaces Li in the hydroxide layer resulting in enhanced magnetization in the (Li0.876Fe0.062Mn0.062OD)FeSe superconductor without significantly altering the superconducting behavior as resolved by magnetic susceptibility and electrical/thermal transport measurements. As a result, long-range magnetic ordering was observed below 12 K with neutron diffraction measurements. This work has implications for the design of magnetic superconductors for the fundamental understanding of superconductivity and magnetism in the iron chalcogenide system as well as exploitation as functional materials for next generation devices. arXiv:1912.09329v1 [cond-mat.supr-con]

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Section: Hydrothermal Synthesis and Crystallographic Resultssupporting

confidence: 88%

Long-range magnetic order in hydroxide-layer-doped (Li1−x−yFexMnyOD)FeSe

Wilfong

Zhou

Zheng

et al. 2020

Phys. Rev. Materials

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“…Therefore, the superconducting samples contains more Fe in the hydroxide layer and consequently more electron doping (0.13 e – vs. 0.09 e – ) into the FeS layer. Similarly, Zhou et al 25 have reported that for the selenide analogues, higher T c 's were achieved with lower reaction temperatures so that more iron cations could incorporate into the lithium hydroxide layer. Studies on the same system by Clarke et al demonstrated that the iron in the hydroxide layer is Fe 2+ and that iron vacancies in the FeSe layer degraded the superconducting properties.…”

Section: Resultsmentioning

confidence: 89%

“…The latter condition was maintained by the inclusion of tin metal plate as a way to dynamically change the hydrothermal conditions from oxidizing to more reducing. 25 No tin was found in the products as determined from energy dispersive X-ray spectroscopy (EDS).…”

Section: Resultsmentioning

confidence: 99%

Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides

et al. 2017

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“…Indeed, neutron diffraction study by Zhou et al x Fe x OD)FeSe found crystallographic evidence for O-D· · ··Se bonding where the Se-D distance was approximately 3.03Å. [153] The intercalation chemistry of FeSe also has similarities with the superconducting fullerenes (see section ??). The amount of charge doping in both sets of materials seems to be critical to raising the T c .…”

Section: Discussionmentioning

confidence: 99%

The intercalation chemistry of layered iron chalcogenide superconductors

Vivanco

Rodriguez

2016

Journal of Solid State Chemistry

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The iron chalcogenides FeSe and FeS are superconductors composed of two-dimensional sheets held together by van der Waals interactions, which makes them prime candidates for the intercalation of various guest species. We review the intercalation chemistry of FeSe and FeS superconductors and discuss their synthesis, structure, and physical properties. Before we review the latest work in this area, we provide a brief background on the intercalation chemistry of other inorganic materials that exhibit enhanced superconducting properties upon intercalation, which include the transition metal dichalcogenides, fullerenes, and layered cobalt oxides. From past studies of these intercalated superconductors, we discuss the role of the intercalates in terms of charge doping, structural distortions, and Fermi surface reconstruction. We also briefly review the physical and chemical properties of the host materials---mackinawite-type FeS and $\beta$-FeSe. The three types of intercalates for the iron chalcogenides can be placed in three categories: 1.) alkali and alkaline earth cations intercalated through the liquid ammonia technique; 2.) cations intercalated with organic amines such as ethylenediamine; and 3.) layered hydroxides intercalated during hydrothermal conditions. A recurring theme in these studies is the role of the intercalated guest in electron doping the chalcogenide host and in enhancing the two-dimensionality of the electronic structure by spacing the FeSe layers apart. We end this review discussing possible new avenues in the intercalation chemistry of transition metal monochalcogenides, and the promise of these materials as a unique set of new inorganic two-dimensional systems

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The preparation and phase diagrams of (⁷Li_1−xFe_xOD)FeSe and (Li_1−xFe_xOH)FeSe superconductors

Abstract: We report the phase diagram for the superconducting system (7Li1−xFexOD)FeSe and contrast it with that of (Li1−xFexOH)FeSe both in single crystal and powder forms.

Cited by 34 publications

References 50 publications

Long-range magnetic order in hydroxide-layer-doped (Li1−x−yFexMnyOD)FeSe

Long-range magnetic order in hydroxide-layer-doped (Li1−x−yFexMnyOD)FeSe

Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides

The intercalation chemistry of layered iron chalcogenide superconductors

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