Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1

MA 21.9: Talk

Tuesday, March 21, 2017, 11:45–12:00, HSZ 304

Synthesis and magnetic properties of double perovskites with Ir(IV)-states — •Michael Vogl¹, Tusharkanti Dey^1,2, Laura Teresa Corredor Bohorquez¹, Saicharan Aswartham¹, Anja Wolter-Giraud¹, Sabine Wurmehl¹, and Bernd Büchner¹ — ¹Leibniz Institute for Solid State and Materials Research , Dresden, Germany — ²EP-VI, Electronic Correlations and Magnetism, University of Augsburg, Germany

With strong spin-orbit coupling 5d-based iridates exhibit many interesting phenomena and ground states. Here, we synthesized and investigated two series of 5d-based double perovskites La₂Co_1−xZn_xIrO₆ and La₂Cu_1−xZn_xIrO₆. Polycrystalline samples of the substitution series were synthesized by conventional solid state reaction and characterized by structural, magnetic and specific heat measurements. In both parent compounds (x=0) complex magnetic interactions between the strongly spin-orbit coupled 5d-ion Ir⁴⁺ and a magnetic 3d-transition metal ion (Co/Cu) are present. Dilution with non-magnetic Zn²⁺ is used to further study this interaction.

The evolution of the magnetic properties throughout both series is discussed. A strong shift of the transition temperatures to lower temperatures can be observed with increasing Zn-content. The magnetic phase diagram for both the series is mapped out.