Magnetic phase transitions and superconductivity in strained FeTe

Abstract

The influence of hydrostatic pressure and ab-plane strain on the magnetic structure of FeTe is investigated from first principles. The results of calculations reveal a phase transition from antiferromagnetic double-stripe ordering at ambient pressure to ferromagnetic ordering at 2 GPa, or under compressive strain reducing the lattice parameter a by about 3%. In turn, a tensile strain of less than 2% induces the phase transition to antiferromagnetic single-stripe ordering. It corresponds to the superconducting FeTe thin films, thereby confirming that the superconducting state is positively linked to single-stripe antiferromagnetic fluctuations. Both types of transition indicate that the position of Te atoms in the crystal is crucial for the magnetic and superconducting properties of iron chalcogenides.

8 pages, 8 figures

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• Molecular beam epitaxy preparation and in situ characterization of FeTe thin films
• Electronic Structure of Fe${}_{1.08}$Te bulk crystals and epitaxial FeTe thin films on Bi${}_2$Te${}_3$
• Electronic structure of ruthenium-doped iron chalcogenides
• The influence of magnetic order on the magnetoresistance anisotropy of Fe${}_{1+\delta -x}$Cu${}_x$Te