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Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1

TT 25.11: Talk

Tuesday, March 21, 2017, 12:15–12:30, HSZ 304

The iridium double perovskites with Ir5+ revised: a combined structural and specific heat study — •Mihai I. Sturza1, Laura T. Corredor1, Gizem Aslan Cansever1, Kaustuv Manna1, Sebastian Gass1, Tushar Dey1, Christian Blum1, Andrey Maljuk1, Olga Kataeva2, Sabine Wurmehl1, Anja Wolter1, and Bernd Büchner11Leibniz Institute for Solid State and Materials Research IFW, Institute for Solid State Research, 01069 Dresden, Germany — 2A.E. Arbuzov Institute of Organic and Physical Chemistry, Russian Academy of Sciences, Kazan, Russia

Recently, the iridate double perovskite Sr2YIrO6 has attracted considerable attention due to the report of unexpected magnetism in this Ir5+ material, in which according to the Jeff model, a non-magnetic ground state is expected. We present a structural, magnetic and thermodynamic characterization of Sr2YIrO6 and Ba2YIrO6 single crystals, with emphasis on the temperature and magnetic field dependence of the specific heat. In agreement with the expected non-magnetic ground state of Ir5+ (5d4) in these iridates, no magnetic transition is observed down to 430 mK. Moreover, our results suggest that the low temperature anomaly observed in the specific heat is not related to the onset of long-range magnetic order. Instead, it is identified as a Schottky anomaly caused by paramagnetic impurities present in the sample, of the order of 0.5(2) %. These impurities lead to non-negligible spin correlations, which nonetheless, are not associated with long-range magnetic ordering.

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