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Structural and thermodynamic properties of Fe1.12Te with multiple phase transitions

Cherian, Dona and Roessler, S and Koz, C and Tsirlin, AA and Schwarz, U and Wirth, S and Elizabeth, Suja (2014) Structural and thermodynamic properties of Fe1.12Te with multiple phase transitions. In: JOURNAL OF APPLIED PHYSICS, 115 (12).

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Official URL: http://dx.doi.org/10.1063/1.4870233


The parent compound of iron chalcogenide superconductors, Fe1+yTe, with a range of excess Fe concentrations exhibits intriguing structural and magnetic properties. Here, the interplay of magnetic and structural properties of Fe1.12Te single crystals have been probed by low-temperature synchrotron X-ray powder diffraction, magnetization, and specific heat measurements. Thermodynamic measurements reveal two distinct phase transitions, considered unique to samples possessing excess Fe content in the range of 0.11 <= y <= 0.13. On cooling, an antiferromagnetic transition, T-N approximate to 57K is observed. A closer examination of powder diffraction data suggests that the transition at TN is not purely magnetic, but accompanied by the commencement of a structural phase transition from tetragonal to orthorhombic symmetry. This is followed by a second prominent first-order structural transition at T-S with T-S < T-N, where an onset of monoclinic distortion is observed. The results point to a strong magneto-structural coupling in this material. (C) 2014 AIP Publishing LLC.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the AMER INST PHYSICS, USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 03 Jun 2014 08:25
Last Modified: 03 Jun 2014 08:25
URI: http://eprints.iisc.ac.in/id/eprint/49080

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