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TT: Fachverband Tiefe Temperaturen
TT 3: Correlated Electrons: Frustrated Magnets - Pyrochlore Systems and Iridates
TT 3.10: Talk
Monday, March 7, 2016, 12:00–12:15, H20
On the search for magnetic correlations in double perovskites — •Franziska Hammerath1,2, Rajib Sarkar1, Sirko Kamusella1, C. Baines3, H.-H. Klauss1, T. Dey2, Gizem Aslan Cansever2, Kaustuv Manna2, Andreas Zimmermann2, Andrey Maljuk2, Mihai Sturza2, Dmitriy Efremov2, Sabine Wurmehl2, and Bernd Büchner2 — 1Institute for Solid State Physics, Dresden Technical University, TU Dresden, 01062 Dresden, Germany — 2IFW Dresden, Institute for Solid State Research, PF 270116, 01171 Dresden, Germany — 3Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen, PSI, Switzerland
The cubic double perovskite Ba2YIrO6 has been investigated by the local probe techniques NMR and µSR. Both methods confirm the absence of long range order in this compound, but observe signatures of magnetic correlations: The NMR spin-lattice relaxation rate suggests the presence of growing magnetic correlations at low temperatures. An increase of the µSR spin-lattice relaxation rate confirms the presence of weak magnetism. These findings cannot be explained by the recently suggested excitonic type of magnetism [1], but also go beyond a simple nonmagnetic ground state picture of the 5d4 (Jeff=0) electronic configuration of Ir5+. In the monoclinic analog Sr2YIrO6, the NMR line width and spin-lattice relaxation rates reveal a nonmagnetic behavior, in contrast to a first report [2], but in line with a recent study [3].
G. Khaliullin, PRL 111, 197201 (2013).
G. Cao et al., PRL 112, 056402 (2014).
B. Ranjbar et al., Inorg. Chem. 54, 10468 (2015).