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.
@article{arxiv.1311.5732,
title = {Magnetic phase transitions and superconductivity in strained FeTe},
author = {A. Ciechan and M. J. Winiarski and M. Samsel-Czekała},
journal= {arXiv preprint arXiv:1311.5732},
year = {2014}
}