Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 25: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1
TT 25.1: Talk
Tuesday, March 21, 2017, 09:30–09:45, HSZ 304
Quantum spin liquid ground state in Ba3InIr2O9: A combined NMR and µSR study — •Mayukh Majumder1, Tusharkanti Dey1, Jean-Christophe Orain2, Norbert Buettgen3, Alexander Tsirlin1, and Philipp Gegenwart1 — 1EP-VI, EKM, University of Augsburg, Germany — 2Paul Scherrer Institute, Switzerland — 3EP-V, EKM, University of Augsburg, Germany
5d Iridium based systems have drawn a lot of attention because of the presence of similar energy scales of crystal field splitting, spin-orbit coupling and on-site Coulomb interaction which give rise to unconventional ground states. In the present compound Ba3InIr2O9 (Ir has an average of +4.5 oxidation state), Ir-dimers aligned along crystallographic c-axis form a triangular lattice which promotes frustration. The magnetization and specific heat show no evidence of long-range magnetic ordering down to 400 mK. We have employed 115In (I=9/2) NMR and µSR to study the microscopic nature of the ground state. 115In Knight shift and line width exhibit a temperature independent behavior below 1.4 K down to 25 mK which indicates no static correlations are developing down to such a low temperature whereas the nuclear spin-lattice relaxation rate (1/T1) shows a dynamical behavior in the same temperature range and follows a T2.2 power law. Furthermore, we have carried out µSR experiments which also discarded the presence of any static long-range ordering and provide the evidence of dynamical fluctuations down to 25 mK. Altogether, local probes provide strong evidence for gapless quantum spin liquid ground state in Ba3InIr2O9.