Superconductivity in iron telluride thin films under tensile stress

Details Superconductivity in iron telluride thin films under tensile stress Superconductivity in iron telluride thin films under tensile stress

2009-11-27

arxiv.org/abs/0911.5282v1

Phys. Rev. Lett 104, 017003 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, accepted by Physical Review Letters

Scientific paper

10.1103/PhysRevLett.104.017003

By realizing in thin films a tensile stress state, superconductivity of 13 K was introduced into FeTe, an non-superconducting parent compound of the iron pnictides and chalcogenides, with transition temperature higher than that of its superconducting isostructural counterpart FeSe. For these tensile stressed films, the superconductivity is accompanied by the softening of the first-order magnetic and structural phase transition; and also, the in-plane extension and out-of-plane contraction are universal in all FeTe films independent of sign of lattice mismatch, either positive or negative. Moreover, the correlations were found exist between the transition temperatures and the tetrahedra bond angles in these thin films.

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