Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.26: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Coexistence of 3d-Ferromagnetism and Superconductivity in (Li _1−xFe_xOH)(Fe_1−yLi_ySe) — •Felix Brückner¹, Rajib Sarkar¹, Sirko Kamusella¹, Hubertus Luetkens², Ursula Pachmayr³, Fabian Nitsche³, Hans-Henning Klauss¹, and Dirk Johrendt³ — ¹Institut für Festkörperphysik, Technische Universität Dresden, Germany — ²Paul-Scherrer-Institut, Villigen, Switzerland — ³Department Chemie, Ludwig-Maximilians-Universität München, Germany

In the family of iron-based superconductors, where the superconducting dome is usually separated from the magnetic phase, only few compounds show ferromagnetism arising in the superconducting state. The so far discovered examples show ferromagnetic ordering of Eu²⁺ ions. In this context, the presented ordering of iron orbitals in (Li _1−xFe_xOH)(Fe_1−yLi_ySe) is unique.

We performed a wealth of experimental methods to characterize the physics in this system, including dc resistivity and magnetization. With use of local probes (µSR,NMR,Mößbauer), we are able to describe the emergence of bulk ferromagnetism and superconductivity in a microscopic scale. Both phenomena can coexist, though they compete with each other, due to a spatial separation in the multilayer system.