  The low-temperature crystal structure of Fe1.13Te, which exhibits an
anomalous two-step magnetic transition, was clarified by the systematic x-ray
diffraction measurements. It was found that two-step structural phase
transition, tetragonal-orthorhombic-monoclinic, occurred correspondingly to the
two-step magnetic transition. The detailed analysis of the profile at 5 K
indicated the coexistence of the minor orthorhombic area inside the major
monoclinic lattice, which could explain the lower-shift (suppression) of the
antiferromagnetic transition temperature in Fe1.13Te and suggest a possibility
of superconductivity at the domain boundary.
