Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 36: Superconductivity: Fe-based Superconductors - Fe(Se,Te), LiFeAs, and other Materials
TT 36.6: Vortrag
Mittwoch, 13. März 2013, 10:45–11:00, H18
Incommensurate magnetism and structural phase transition in Fe1+yTe — •Oliver Stockert1, Sahana Rössler1, Enrico Faulhaber2, Astrid Schneidewind2, Cevriye Koz1, Dona Cherian3, Suja Elizabeth3, Ulrich Schwarz1, and Steffen Wirth1 — 1Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, 01187, Dresden, Germany — 2Gemeinsame Forschergruppe, Helmholtz-Zentrum Berlin - TU Dresden, Lichtenbergstraße 1, 85474 Garching — 3Department of Physics, Indian Institute of Science, Bangalore 560012, India
The superconductivity with transiton temperature Tc = 8 K found in Fe1.01Se ignited interest due to its simple crystal structure. The bulk Fe1+yTe is non-superconducting, but exhibits an antiferromagnetic order that is not driven by the Fermi suface nesting and relatively large ordered moment on the Fe-sublattices. Fe1+yTe also undergoes a structural distortion at low temperatures, and both magnetic and structral transitions can be strongly influenced by tunig parameters such as excess Fe (y) or external pressure [1, 2]. The themodynamic measurements revealed a single first-order transition for Fe1.11Te, whereas two distinct phase transitions have been found for Fe1.13Te. Here we present the results of neutron diffraction experiments on single crystalline Fe1.11Te and Fe1.13Te samples and show that Fe1+yTe display unique interplay of incommensurate magnetism and structural phase transition in comparison to the other parent Fe-superconductors.
[1] S. Rößler et al., Phys. Rev. B 84, 174506 (2011)
[2] C. Koz et al., Phys. Rev. B 86, 094505 (2012)