Structure and Superconductivity of FeSe_{1 - x} and FeTe_{1 - y}Se_{y} Crystals: Dependence on the Synthesis Methods, Starting Composition, and Growth Conditions

• Authors: D. Gawryluk , J. Fink-Finowicki , A. Wiśniewski , R. Puźniak , V. Domukhovski , R. Diduszko , M. Berkowski
• Languages of publication: EN

Abstracts

EN

Syntheses of superconducting iron chalcogenides FeSe_{1 - x} (x = 0-0.15) and FeTe_{1 - y}Se_{y} (y = 0.3-0.55) were performed. Superconducting phase of iron selenide was obtained by the solid-state reaction and from liquid phase. The highest values of critical temperature (T_c = 8.2-8.7 K) exhibit FeSe_{1-x} obtained by the crystallization from a melt with excess of iron less than 1 mol%. The samples from a melt contain up to 78% of tetragonal phase, as estimated by the X-ray diffraction. Lattice parameters and unit cell volume for the samples exhibiting highest T_{c} and sharpest transition to superconducting state are limited to narrow range, with c/a ratio close to 1.469. The samples with excess of selenium contain higher amount of hexagonal phase than stoichiometric one. Superconducting single-crystalline samples of FeTe_{1 - y}Se_{y} (up to 100% of tetragonal phase) were obtained using Bridgman's method. When y value increases, the volume of unit cell decreases. The critical temperature T_{c} changes from ≈ 11.5 K for y ≈ 0.3 to ≈ 14.7 K for y ≈ 0.5.

Keywords

EN

61.05.cp; 74.25.Ha; 74.62.Bf; 74.70.Xa; 81.10.Fq

Discipline

• 74.62.Bf: Effects of material synthesis, crystal structure, and chemical composition(for methods of materials synthesis, see 81.20.-n)
• 74.25.Ha: Magnetic properties including vortex structures and related phenomena(for vortices, magnetic bubbles, and magnetic domain structure, see 75.70.Kw)
• 81.10.Fq: Growth from melts; zone melting and refining
• 61.05.cp: X-ray diffraction
• 74.70.Xa: Pnictides and chalcogenides

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 2
• Pages: 331-335

Dates

published

2010-08

Contributors

author

D. Gawryluk

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warsaw, Poland

author

J. Fink-Finowicki

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warsaw, Poland

author

A. Wiśniewski

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warsaw, Poland

author

R. Puźniak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warsaw, Poland

author

V. Domukhovski

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warsaw, Poland

author

R. Diduszko

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warsaw, Poland
• Institute of Electronic Materials Technology, Wólczyńska 133, PL-01-919 Warsaw, Poland

author

M. Berkowski

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02-668 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.118.331