Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.54: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

NMR Investigation of Ir-based Double Perovskites — •Margarita Iakovleva1,2,3, Evgeniia Vavilova3, Hans-Joachim Grafe1, Manna Kaustuv4, Michael Vogl1,2, Tusharkanti Dey5, Sabine Wurmehl1, Bernd Büchner1,2, and Vladislav Kataev11IFW Dresden, Dresden, Germany — 2TU Dresden, Dresden, Germany — 3Zavoisky Physical-Technical Institute, Kazan, Russia — 4Max-Planck-Institute for Chemical Physics of Solids, Dresden, Germany — 5Universität Augsburg, Augsburg, Germany

Iridium based double perovskites are unique materials where Coulomb repulsion, strong spin-orbit coupling, exchange interaction and crystal field have comparable energy scales. The interplay between all of these interactions and correlations may lead to the emergence of novel electronic and magnetic states. In this work we report the 139La nuclear magnetic resonance (NMR) results on the double perovskite compounds La2MIrO6 with magnetic and nonmagnetic ions at the M position (M = Co, Cu, Zn). Nuclear relaxation rate T1−1 measurements in La2CuIrO6 show the peak at T ≈ 74 K that is the signature of a magnetic transition. Moreover with further decreasing the temperature the T-dependence of T1−1 shows the shoulder at T ≈ 60  K that can be associated with a cooperative ordering of the transverse moments. In case of La2CoIrO6 the T1−1 measurements do not show any anomalies at T below the ordering temperature. Our investigation has revealed complex magnetic interactions in the compound where strongly spin-orbit coupled 5d transition metal ions coexist with strongly correlated spin-only 3d (Co, Cu) and non-magnetic Zn ions.

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