First-order structural transition in the magnetically ordered phase of Fe(1.13)Te

Roessler, S and Cherian, Dona and Lorenz, W and Doerr, M and Koz, C and Curfs, C and Prots, Yu and Roessler, UK and Schwarz, U and Elizabeth, Suja and Wirth, S (2011) First-order structural transition in the magnetically ordered phase of Fe(1.13)Te. In: Physical Review B: Condensed Matter and Materials Physics, 84 (17).

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Abstract

Specific heat, resistivity, magnetic susceptibility, linear thermal expansion (LTE), and high-resolution synchrotron x-ray powder diffraction investigations of single crystals Fe(1+y) Te (0.06 <= y <= 0.15) reveal a splitting of a single, first-order transition for y <= 0.11 into two transitions for y >= 0.13. Most strikingly, all measurements on identical samples Fe(1.13)Te consistently indicate that, upon cooling, the magnetic transition at T(N) precedes the first-order structural transition at a lower temperature T(s). The structural transition in turn coincides with a change in the character of the magnetic structure. The LTE measurements along the crystallographic c axis display a small distortion close to T(N) due to a lattice striction as a consequence of magnetic ordering, and a much larger change at T(s). The lattice symmetry changes, however, only below T(s) as indicated by powder x-ray diffraction. This behavior is in stark contrast to the sequence in which the phase transitions occur in Fe pnictides.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	07 Dec 2011 06:33
Last Modified:	07 Dec 2011 06:33
URI:	http://eprints.iisc.ac.in/id/eprint/42528

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