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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 Fe_1+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 T_c = 8 K found in Fe_1.01Se ignited interest due to its simple crystal structure. The bulk Fe_1+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. Fe_1+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 Fe_1.11Te, whereas two distinct phase transitions have been found for Fe_1.13Te. Here we present the results of neutron diffraction experiments on single crystalline Fe_1.11Te and Fe_1.13Te samples and show that Fe_1+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)