First-order magnetic and structural phase transitions in Fe$_{1+y}$Se$_x$Te$_{1-x}$

Details First-order magnetic and structural phase transitions in Fe$_{1+y}$Se$_x$Te$_{1-x}$ First-order magnetic and structural phase transitions in Fe$_{1+y}$Se$_x$Te$_{1-x}$

2008-11-02

arxiv.org/abs/0811.0195v1

Phys. Rev. B 79, 054503 (2009)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.79.054503

We use bulk magnetic susceptibility, electronic specific heat, and neutron scattering to study structural and magnetic phase transitions in Fe$_{1+y}$Se% $_x$Te$_{1-x}$. Fe$_{1.068}$Te exhibits a first order phase transition near 67 K with a tetragonal to monoclinic structural transition and simultaneously develops a collinear antiferromagnetic (AF) order responsible for the entropy change across the transition. Systematic studies of FeSe$%_{1-x}$Te$_x$ system reveal that the AF structure and lattice distortion in these materials are different from those of FeAs-based pnictides. These results call into question the conclusions of present density functional calculations, where FeSe$_{1-x}$Te$_x$ and FeAs-based pnictides are expected to have similar Fermi surfaces and therefore the same spin-density-wave AF order.

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