Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Superconductivity: Fe-based Superconductors - Fe(Se,Te), LiFeAs, and other Materials
TT 36.8: Vortrag
Mittwoch, 13. März 2013, 11:30–11:45, H18
Mössbauer and muon spin rotation investigations of magnetic and structural phase transitions in Fe1+yTe — •Philipp Materne1, Til Goltz1, Sirko Bubel1, Rajib Sarkar1, Mathias Doerr1, Cevriye Koz2, Sahana Rössler2, Steffen Wirth2, Ulrich Schwarz2, Ulrich K. Rössler3, Hubertus Luetkens4, and Hans-Henning Klauss1 — 1Institut für Festkörperphysik, TU Dresden, 01062 Dresden, Germany — 2MPI for Chemical Physics of Solids, Nöthnizer Straße 40, 01187, Dresden, Germany — 3IFW Dresden, 01171 Dresden, Germany — 4PSI, 5232 Villigen, Switzerland
Fe1+yTe, the antiferromagnetic parent compound of the Fe-chalcogenide superconductors displays separated magnetic (TN) and structural (Ts) transitions with TN > Ts for y > 0.12 [1].
Such behavior is uncommon for the parent systems of pnictide superconductors.
We performed Mössbauer spectroscopy and muon-spin relaxation experiments on two representative levels of iron excess: i) Fe1.06Te with TN=Ts= 69 K and ii) Fe1.13Te with well separated transitions at TN = 57 K followed by Ts = 46 K.
Both Mössbauer and muon-spin relaxation results clearly display a precursor magnetic state which is only present in Fe1.13Te.
Further, in Fe1.13Te a complex magnetic phase has been observed in the temperature range 40 K ≲ T ≲ 75 K.
We discuss our experimental results in the context of recently published thermodynamic and neutron scattering data on Fe1+yTe[1], [2].
[1] S. Rößler et al., Phys. Rev. B 84 (2011) 174506
E. E. Rodriguez et al., Phys. Rev. B. 84 (2011) 064403