Interplay of structure, magnetism, and superconductivity in Se substituted iron telluride with excess Fe

Cherian, Dona; Rößler, Sahana; Wirth, S.; Elizabeth, Suja

doi:10.1088/0953-8984/27/20/205702

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…Bulk Fe 1+y Te does not show a superconducting transition, but its magnetic and structural properties can be tuned by changing the amount of excess Fe in the sample [3][4][5][6][7]. Substitution of Se for Te in Fe 1+y Te induces superconductivity with a maximum T c ≈ 15 K observed for ≈ 50 % Se substitution [8][9][10][11][12]. Also for the substituted materials, the superconducting as well as the normal state properties of Fe 1+y Te 1−x Se x are found to be influenced by excess Fe.…”

Section: Introductionmentioning

confidence: 99%

Homogeneity Range of Ternary 11-Type Chalcogenides Fe1 + y Te1−x Se x

Koz¹,

Rößler²,

Wirth³

et al. 2016

J Supercond Nov Magn

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The 11-type Fe-chalcogenides belong to the family of Fe-based superconductors. In these compounds, the interstitial Fe is known to strongly influence the magnetic and superconducting properties. Here we present the chemical homogeneity range of ternary compounds Fe1+yTe1−xSex based on powder x-ray diffraction, energy dispersive x-ray analysis and magnetization measurements. Our investigations show that the maximum amount of excess Fe in homogeneous Fe1+yTe1−xSex decreases with increase in Se substitution for Te. Using our synthesis procedure, single-phase Fe1+yTe1−xSex, with 0.5 ≤ x < 1 could not be formed for any amount of excess Fe. Further, the superconducting volume fraction in the material is found to be strongly suppressed by excess Fe.

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Section: Introductionmentioning

confidence: 99%

Homogeneity Range of Ternary 11-Type Chalcogenides Fe1 + y Te1−x Se x

Koz¹,

Rößler²,

Wirth³

et al. 2016

J Supercond Nov Magn

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“…The spin fluctuations are found to be strongly increased near T c , and applied pressure seems to enhance the spin fluctuations along with the superconducting transition temperature 9 . On the other hand, T c of FeSe can also be increased by Te substitution of Se, up to a maximum of T c ≈ 15 K for Fe 1+y Se 0.5 Te 0.5 [11][12][13][14] . The superconducting volume fraction decreases with increasing Te and no superconductivity has been found so far in bulk samples of the endmember Fe 1+y Te.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, phase stability, structural, and physical properties of 11‐type iron chalcogenides

Rößler

Koz

Wirth

et al. 2016

Physica Status Solidi (b)

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This article reviews recent experimental investigations on two binary Fe-chalcogenides: FeSe and Fe1+yTe. The main focus is on synthesis, single crystal growth, chemical composition, as well as on the effect of excess iron on structural, magnetic, and transport properties of these materials. The structurally simplest Fe-based superconductor Fe1+xSe with a critical temperature Tc ≈ 8.5 K undergoes a tetragonal to orthorhombic phase transition at a temperature Ts ≈ 87 K. No longrange magnetic order is observed down to the lowest measured temperature in Fe1+xSe. On the other hand, isostructural Fe1+yTe displays a complex interplay of magnetic and structural phase transitions in dependence on the tuning parameter such as excess amount of Fe or pressure, but it becomes a superconductor only when Te is substituted by a sufficient amount of Se. We summarize experimental evidence for different competing interactions and discuss related open questions.

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“…Further, excess Fe in Fe 1+y Te 1−x Se x has been found to be essential for magnetism, but proved to be detrimental for superconductivity [22]. Note that about 10 % substitution of Se for Te induces superconductivity [23][24][25]. Therefore the following questions naturally arise: (i) in which way are the interactions altered if the Fe is partially replaced by other transition metal ions?…”

Section: Introductionmentioning

confidence: 99%

Effect of Co and Ni substitution on the two magnetostructural phase transitions inFe1.12Te

et al. 2016

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Here we present the results of high-resolution x-ray diffraction experiments along with specific heat, resistivity, and magnetization measurements of chemically well-characterized Fe 1.12−x M x Te (M = Co, Ni) samples. The motivation is to investigate how the two coupled magnetostructural phase transitions in the antiferromagnetic parent compound Fe 1.12 Te of chalcogenide superconductors can be tuned. While the two-step magnetostructural transition (tetragonal-to-orthorhombic followed by orthorhombic-to-monoclinic) persists in Fe 1.10 Co 0.02 Te, only one, tetragonal-to-orthorhombic transition was observed in Fe 1.10 Ni 0.02 Te. Upon increasing the Co and Ni substitution, the structural phase transitions and the long-range magnetic order are systematically suppressed without any sign of superconductivity. For high substitution levels (x 0.05), a spin-glass-like behavior was observed and the low-temperature structure remains tetragonal. From our results, it can be inferred that the electron doping strongly suppresses the magnetostructural phase transitions.

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Interplay of structure, magnetism, and superconductivity in Se substituted iron telluride with excess Fe

Cited by 4 publications

References 32 publications

Homogeneity Range of Ternary 11-Type Chalcogenides Fe1 + y Te1−x Se x

Homogeneity Range of Ternary 11-Type Chalcogenides Fe1 + y Te1−x Se x

Synthesis, phase stability, structural, and physical properties of 11‐type iron chalcogenides

Effect of Co and Ni substitution on the two magnetostructural phase transitions inFe1.12Te

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