Thermopower of Co-doped FeSe

Thomas, E.; Wong‐Ng, W.; Phelan, Daniel; Millican, Jasmine N.

doi:10.1063/1.3100198

Cited by 27 publications

(30 citation statements)

References 13 publications

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“…All of the transition metals (Ti, V, Cr, Mn, Co, Ni and Cu) were incorporated into the FeSe structure with a substitution ratio below 10 at.%. It was claimed that Fe ions can be substituted by Co up to 50 at.% [22], and disappearance of superconductivity was reported for all β -FeSe 1− x samples substituted by Co at above 2.5 at.% [21]. In contrast, for Fe 1− z Co z Se 1− x with z equal to 0.05 and 0.1, the critical onset temperature ( T c,onset ) was 10 and 5 K, respectively [23].…”

Section: Crystal Growthmentioning

confidence: 99%

“…Clearly, the lattice contraction for Fe 1− x Co x Se 0.5 Te 0.5 crystals is much larger than those of Fe 1− x Co x Se 0.85 [22, 23] and Fe 1− x Co x Se 0.5 Te 0.5 bulk samples [24, 28, 29]. This can be explained by the fact that the Co substitution levels on Fe sites in polycrystalline samples are overestimated due to a possible segregation in the grain boundaries and impurity phases.…”

Section: Crystal Growthmentioning

confidence: 99%

“…(a) Compositional dependence of lattice contraction along the a - axis (black solid symbols) and c -axis (red open symbols) for Fe 1− x Co x Se 0.5 Te 0.5 crystals (squares) and Fe 1− x Co x Se polycrystalline samples (normal triangles [23] and inverted triangles [22]). (b) Temperature dependence of in-plane resistivity for Fe 1− x Co x Se 0.5 Te 0.5 crystals ( x = 0–0.1).…”

Section: Crystal Growthmentioning

confidence: 99%

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Recent advances in β-FeSe_1−x and related superconductors

Wang

Yeh

2013

Science and Technology of Advanced Materials

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It has been more than four years since the discovery of β-FeSe1−x superconductors. Through the efforts of many outstanding research groups, unprecedented advances in the field have been achieved. High-quality single crystals of β-FeSe1−x and related compounds have been prepared by various techniques, allowing us to explore in detail the physical properties of this class of materials. Detailed characterizations of the structure and properties of these crystals have helped us to understand the origin of superconductivity in β-FeSe1−x. The occurrence of superconductivity is associated with the low-temperature structure distortion, which is accompanied by several anomalies. Recent measurements on quasiparticle and acoustic phonon dynamics with respect to the orbital modification in β-FeSe1−x suggest the opening of an energy gap below 130–140 K, accompanied by a coincident transfer of optical spectral weight in the visible range and alterations in transport properties. These observations provide convincing evidence that the modification of the electronic structure occurs prior to the lattice distortion. They further suggest that the high-temperature gap and the lattice symmetry breaking are driven by short-range orbital and/or charge orders.

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Section: Crystal Growthmentioning

confidence: 99%

Section: Crystal Growthmentioning

confidence: 99%

Section: Crystal Growthmentioning

confidence: 99%

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Recent advances in β-FeSe_1−x and related superconductors

Wang

Yeh

2013

Science and Technology of Advanced Materials

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“…Intriguingly, till now, no ARPES study has been made on the more correlated charge doped 11-type iron chalcogenides, which motivated us for the present study, though there are transport [32][33][34][35], thermal [36], and magnetic measurements [37] reporting on this issue. These studies suggest that the transition metal substitution for Fe in FeTe 1−x Se x leads to a metal-insulator transition at high concentrations.…”

Section: Introductionmentioning

confidence: 99%

Effect of impurity substitution on band structure and mass renormalization of the correlatedFeTe0.5Se0.5superconductor

et al. 2016

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Using angle-resolved photoemission spectroscopy (ARPES), we studied the effect of the impurity potential on the electronic structure of FeTe 0.5 Se 0.5 superconductor by substituting 10% of Ni for Fe, which leads to an electron doping of the system. We could resolve three hole pockets near the zone center and an electron pocket near the zone corner in the case of FeTe 0.5 Se 0.5 , whereas only two hole pockets near the zone center and an electron pocket near the zone corner are resolved in the case of Fe 0.9 Ni 0.1 Te 0.5 Se 0.5 , suggesting that the hole pocket having predominantly the xy orbital character is very sensitive to the impurity scattering. Upon electron doping, the size of the hole pockets decreases and the size of the electron pockets increases as compared to the host compound. However, the observed changes in the size of the electron and hole pockets are not consistent with the rigid-band model. Moreover, the effective mass of the hole pockets is reduced near the zone center and of the electron pockets is increased near the zone corner in the doped Fe 0.9 Ni 0.1 Te 0.5 Se 0.5 as compared to FeTe 0.5 Se 0.5 . We refer these observations to the changes of the spectral function due to the effect of the impurity potential of the dopants.

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“…Iron chalcogenides belong to an important family of inorganic functional materials that have been studied extensively due to their wide applications in solar cells, [1] lithium batteries, [2,3] sensors, [4] thermoelectric devices, [5] spin electronic devices, [6] etc. Recently, the exciting discovery of superconductivity with zero-resistance transition temperature at 8 K in the PbO-type a-FeSe compound [7] has made iron chalcogenides a very hot research topic.…”

Section: Introductionmentioning

confidence: 99%

Selective Synthesis of Fe₇Se₈ Polyhedra with Exposed High‐Index Facets and Fe₇Se₈ Nanorods by a Solvothermal Process in a Binary Solution and Their Collective Intrinsic Properties

Gao

Lin

Jiang

et al. 2011

Chemistry A European J

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Fe(7)Se(8) polyhedra with high-index facets and Fe(7)Se(8) nanorods can be selectively synthesized by a solvothermal reaction in a mixed solvent of diethylenetriamine (DETA) and deionized water (DIW). It is found that the morphologies of Fe(7)Se(8) nanocrystals can be effectively controlled by adjusting the volume ratio of DETA and DIW. The unusual polyhedral crystals are bounded by two {001} and twelve {012} facets. The intrinsic properties of Fe(7)Se(8) nanocrystals have been investigated. Magnetic measurements indicate that the obtained polyhedra and nanorods show a weak ferromagnetic ordering at room temperature. In particular, a new photoluminescence emission at 403 nm from the Fe(7)Se(8) nanocrystals has been observed. The described solvothermal reaction in a mixed solvent may be extended to the synthesis of other transition-metal chalcogenide crystals with controlled shape, facets, and structure, which may bring new functionalities.

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Thermopower of Co-doped FeSe

Cited by 27 publications

References 13 publications

Recent advances in β-FeSe_1−x and related superconductors

Recent advances in β-FeSe_1−x and related superconductors

Effect of impurity substitution on band structure and mass renormalization of the correlatedFeTe0.5Se0.5superconductor

Selective Synthesis of Fe₇Se₈ Polyhedra with Exposed High‐Index Facets and Fe₇Se₈ Nanorods by a Solvothermal Process in a Binary Solution and Their Collective Intrinsic Properties

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Thermopower of Co-doped FeSe

Cited by 27 publications

References 13 publications

Recent advances in β-FeSe1−x and related superconductors

Recent advances in β-FeSe1−x and related superconductors

Effect of impurity substitution on band structure and mass renormalization of the correlatedFeTe0.5Se0.5superconductor

Selective Synthesis of Fe7Se8 Polyhedra with Exposed High‐Index Facets and Fe7Se8 Nanorods by a Solvothermal Process in a Binary Solution and Their Collective Intrinsic Properties

Contact Info

Product

Resources

About

Recent advances in β-FeSe_1−x and related superconductors

Recent advances in β-FeSe_1−x and related superconductors

Selective Synthesis of Fe₇Se₈ Polyhedra with Exposed High‐Index Facets and Fe₇Se₈ Nanorods by a Solvothermal Process in a Binary Solution and Their Collective Intrinsic Properties