Relationship between Structure and Superconductivity in FeSe1-xTex

Horigane, Kazumasa; Hiraka, Haruhiro; Ohoyama, Kenji

doi:10.1143/jpsj.78.074718

Cited by 97 publications

(99 citation statements)

References 24 publications

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“…2 for comparison) clearly diverge from Vegard's law, thus indicating a structural difference between β-FeTe and β-FeSe, probably related to the Se-vacancies in pure iron selenide. These results are in good agreement with those already existing in the literature [10,11,15,19]. In order to understand the structural and physical role of excess Fe in the additional site, we have studied the evolution of various parameters with both the refined Fe content and Se-doping.…”

Section: Structure Refinementsupporting

confidence: 89%

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Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe1+xTe1−ySey

Viennois

Giannini

Marel

et al. 2010

Journal of Solid State Chemistry

117

137

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Single crystals of Fe 1+x Te 1−y Se y have been grown with a controlled Fe excess and Se doping, and the crystal structure has been refined for various compositions. The systematic investigation of magnetic and superconducting properties as a function of the structural parameters shows how the material can be driven into various ground states, depending on doping and the structural modifications. Our results prove that the occupation of the additional Fe site, Fe2, enhances the spin localization. By reducing the excess Fe, the antiferromagnetic ordering is weakened, and the superconducting ground state is favored. We have found that both Fe excess and Se doping in synergy determine the properties of the material and an improved 3-dimensional phase diagram is proposed.

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Section: Structure Refinementsupporting

confidence: 89%

“…Such a transition is therefore related to the occurrence of the superconducting state. In contrast, in superconducting Fe 1+x (Te,Se) the low-temperature lattice is still tetragonal [19]. Finally, the superconducting states of the pure FeSe 1−y and Te-doped Fe 1+x (Te,Se) are reported to present important differences [10].…”

Section: Introductionmentioning

confidence: 96%

Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe1+xTe1−ySey

Viennois

Giannini

Marel

et al. 2010

Journal of Solid State Chemistry

117

137

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show abstract

“…In a previous NPD investigation 18 only the h00 peaks broaden on cooling, but a similar behaviour characterizes e.g. also the hh0, the hhh peaks and in general all those peaks with a strong component lying in the ab plane.…”

Section: Neutron Powder Diffractionsupporting

confidence: 67%

From antiferromagnetism to superconductivity inFe1+yTe1−xSex

et al. 2010

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The nuclear and magnetic structure of Fe 1+y (Te 1-x ,Se x ) (0 ≤ x ≤ 0.20) compounds was analyzed between 2 K and 300 K by means of Rietveld refinement of neutron powder diffraction data.Samples with x ≤ 0.075 undergo a tetragonal to monoclinic phase transition at low temperature, whose critical temperature decreases with increasing Se content; this structural transition is strictly coupled to a long range antiferromagnetic ordering at the Fe site. Both the transition to a monoclinic phase and the long range antiferromagnetism are suppressed for 0.10 ≤ x ≤ 0.20. The onset of the structural and of the magnetic transition remains coincident with the increase of Se substitution. The low temperature monoclinic crystal structure has been revised. Superconductivity arises for x ≥ * Corresponding author: amartin@chimica.unige.it 0.05, therefore a significant region where superconductivity and long range antiferromagnetism coexist is present in the pseudo-binary FeTe -FeSe phase diagram.

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“…It has been shown earlier that lowering the temperature results in the reduction in the Fe-chalcogen height (Z shown in fig 1(a)) in case of FeTe and FeSe 0.5 Te 0.5 while a slight increase in case of FeSe [26]. The magnitude of this decrease is greater in case of FeSe 0.5 Te 0.5 compared to FeTe.…”

Section: Resultsmentioning

confidence: 67%

Photoemission studies of the near E_Fspectral weight shifts in FeSe_1−xTe_xsuperconductor

Mishra¹,

Lohani²,

Zargar³

et al. 2014

J. Phys.: Condens. Matter

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Abstract. Our valence band photoelectron spectroscopic studies show a temperature dependent spectral weight transfer near the Fermi level in the Fe-based superconductor FeSe 1−x Te x . Using theoretical band structure calculations we have shown that the weight transfer is due to the temperature induced changes in the Fe(Se,Te) 4 tetrahedra. These structural changes lead to shifts in the electron occupancy from the xz/yz and x 2 -y 2 orbitals to the 3z 2 -r 2 orbitals indicating a temperature induced crossover from a metallic state to an Orbital Selective Mott (OSM) Phase. Our study presents the observation of a temperature induced crossover to a low temperature OSM phase in the family of Fe chalcogenides.

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Relationship between Structure and Superconductivity in FeSe_1-xTe_x

Cited by 97 publications

References 24 publications

Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe1+xTe1−ySey

Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe1+xTe1−ySey

From antiferromagnetism to superconductivity inFe1+yTe1−xSex

Photoemission studies of the near E_Fspectral weight shifts in FeSe_1−xTe_xsuperconductor

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Relationship between Structure and Superconductivity in FeSe1-xTex

Cited by 97 publications

References 24 publications

Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe1+xTe1−ySey

Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe1+xTe1−ySey

From antiferromagnetism to superconductivity inFe1+yTe1−xSex

Photoemission studies of the near EFspectral weight shifts in FeSe1−xTexsuperconductor

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Product

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Relationship between Structure and Superconductivity in FeSe_1-xTe_x

Photoemission studies of the near E_Fspectral weight shifts in FeSe_1−xTe_xsuperconductor