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Title: Structural and thermodynamic properties of Fe{sub 1.12}Te with multiple phase transitions

The parent compound of iron chalcogenide superconductors, Fe{sub 1+y}Te, with a range of excess Fe concentrations exhibits intriguing structural and magnetic properties. Here, the interplay of magnetic and structural properties of Fe{sub 1.12}Te 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{sub N}≈57 K is observed. A closer examination of powder diffraction data suggests that the transition at T{sub N} 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{sub S} with T{sub S}
Authors:
;  [1] ; ; ; ;  [2] ;  [2] ;  [3]
  1. Department of Physics, Indian Institute of Science, Bangalore 560012 (India)
  2. Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden (Germany)
  3. (Estonia)
Publication Date:
OSTI Identifier:
22271112
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; CONCENTRATION RATIO; COUPLING; IRON TELLURIDES; MAGNETIC PROPERTIES; MAGNETIZATION; MONOCLINIC LATTICES; MONOCRYSTALS; ORTHORHOMBIC LATTICES; PHASE TRANSFORMATIONS; POWDERS; SPECIFIC HEAT; SUPERCONDUCTORS; X-RAY DIFFRACTION