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First-order structural transition in the magnetically ordered phase of Fe1.13Te
Superconductivity · Submitted 6 Sep 2012
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Most strikingly, all measurements on identical samples Fe1.13Te consistently indicate that, upon cooling, the magnetic transition at T_N precedes the first-order structural transition at a lower temperature T_s.
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Specific heat, resistivity, magnetic susceptibility, linear thermal expansion (LTE), and high-resolution synchrotron X-ray powder diffraction investigations of single crystals Fe1+yTe (0.06 < y < 0.15) reveal a splitting of a single, first-order transition for y < 0.11 into two transitions for y > 0.12. Most strikingly, all measurements on identical samples Fe1.13Te 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 displays 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.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Specific heat, resistivity, magnetic susceptibility, linear thermal expansion (LTE), and high-resolution synchrotron X-ray powder diffraction investigations of single crystals Fe1+yTe (0.06 < y < 0.15) reveal a splitting of a single, first-order transition for y < 0.11 into two transitions for y > 0.12. | result 0.89 | 0.93 | 0.33 | asserted 1.00 |
| s1 | Most strikingly, all measurements on identical samples Fe1.13Te consistently indicate that, upon cooling, the magnetic transition at T_N precedes the first-order structural transition at a lower temperature T_s. | result 1.00 | 0.93 | 0.69 | asserted 0.71 |
| s2 | The structural transition in turn coincides with a change in the character of the magnetic structure. | result 0.97 | 0.84 | 0.16 | asserted 1.00 |
| s3 | The LTE measurements along the crystallographic c-axis displays 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. | result 1.00 | 0.94 | 0.08 | asserted 1.00 |
| s4 | The lattice symmetry changes, however, only below T_s as indicated by powder X-ray diffraction. | result 0.99 | 0.91 | 0.11 | asserted 0.85 |
| s5 | This behavior is in stark contrast to the sequence in which the phase transitions occur in Fe pnictides. | interpretation 0.94 | 0.26 | 0.15 | asserted 1.00 |
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Original abstract
Specific heat, resistivity, magnetic susceptibility, linear thermal expansion (LTE), and high-resolution synchrotron X-ray powder diffraction investigations of single crystals Fe1+yTe (0.06 < y < 0.15) reveal a splitting of a single, first-order transition for y < 0.11 into two transitions for y > 0.12. Most strikingly, all measurements on identical samples Fe1.13Te 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 displays 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.
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More recently, Zaliznyak $et al.$ [ref] report $χ(T)$ data for Fe$_1.09$Te which is very similar to those of our sample Fe$_1.13$Te.
Continuous magnetic and structural phase transitions in Fe1+yTe · Results and discussion · 0.98
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