@article{2d3d6e22ea264549ae7b5fcb3e3197c1,
title = "First-order magnetic and structural phase transitions in Fe1+y Sex Te1-x",
abstract = "We use bulk magnetic susceptibility, electronic specific heat, and neutron scattering to study structural and magnetic phase transitions in Fe1+y Sex Te1-x. Fe1.068 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 the FeSe1-x Tex 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 FeSe1-x Tex and FeAs-based pnictides are expected to have similar Fermi surfaces and therefore the same spin-density wave AF order.",
author = "Shiliang Li and {De La Cruz}, Clarina and Q. Huang and Y. Chen and Lynn, {J. W.} and Jiangping Hu and Huang, {Yi Lin} and Hsu, {Fong Chi} and Yeh, {Kuo Wei} and Wu, {Maw Kuen} and Pengcheng Dai",
year = "2009",
month = feb,
day = "2",
doi = "10.1103/PhysRevB.79.054503",
language = "English",
volume = "79",
journal = "Physical Review B - Condensed Matter and Materials Physics",
issn = "1098-0121",
publisher = "American Physical Society",
number = "5",
}