Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.44: Poster

Mittwoch, 14. März 2018, 15:00–19:00, Poster B

Magnetic and thermodynamic characterization of single crystals of La₂MM’O₆ (M = Mg, Zn, Co and M’=Ru, Ir) — •Randirley Beltrán¹, Gaël Bastien¹, Sebastian Gaß¹, Anja U.B. Wolter¹, Ryan Morrow¹, Michael Vogl¹, Mihai Sturza¹, Sabine Wurmehl¹, and Bernd Büchner^1,2 — ¹Leibniz Institute for Solid State and Materials Research, IFW-Dresden, Germany — ²TU Dresden, Germany

In compounds with 4d and 5d transition metal oxides, among them the double perovskites A₂MM’O₆, strong magnetic frustration can be expected due to different origins: competing magnetic interactions and strong spin-orbit coupling. The arrangement of MO₆ and M’O₆ corner-sharing octahedra provide two (magnetic) sub-lattices that results in a variety of magnetic properties related with the competing exchange interactions. For nonmagnetic M ions, the fcc lattice structure of the magnetic M’ ions has been theoretically proposed for hosting Kitaev interactions. In this work we probe the magnetic and thermodynamic properties of the double perovskite single crystals La₂MM′O₆ with M = Mg, Zn, Co and M′= Ir, Ru. We study the magnetic susceptibility and specific heat as function of different parameters, such as temperatue, magnetic field and orientation. Additionally, we use the application of hydrostatic pressure in the mixed 3d-5d compound La₂CoIrO₆ to tune the magnetic ground state of this system, because pressure leads to changes of the magnetic exchange couplings.