Physics – Condensed Matter – Superconductivity
Scientific paper
2011-11-22
Physics
Condensed Matter
Superconductivity
14 pages, 8 figures, 2 tables
Scientific paper
In this paper, we address a number of outstanding issues concerning the nature and the role of magnetic inhomogenities in the iron chalcogenide system FeTe1-xSex and their correlation with superconductivity in this system. We report morphology of superconducting single crystals of FeTe0.65Se0.35 studied with transmission electron microscopy, high angle annular dark field scanning transmission electron microscopy, and their magnetic and superconducting properties characterized with magnetization, specific heat, and magnetic resonance spectroscopy. Our data demonstrate a presence of nanometer scale hexagonal grains coexisting with tetragonal host lattice, a chemical disorder demonstrating non homogeneous distribution of host atoms in the crystal lattice, and hundreds of nanometers long iron-deficient bands. From magnetic data and ferromagnetic resonance temperature dependence, we attribute magnetic inclusions in Fe-Te-Se to Fe3O4 impurity phases as well as hexagonal symmetry nanometer scale grains, identified as Fe7(Te,Se)8. Our results suggest that nonhomogeneous distribution of host atoms might be an intrinsic feature of superconducting Fe-Te-Se chalcogenides and we find a surprising correlation indicating that faster grown crystal of inferior crystallographic properties is a better superconductor.
Aleshkevych Pavlo
Berkowski M.
Dluzewski Piotr
Gawryluk D. J.
Gutowska M. U.
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