Daniel Pajerowski1,Daniel Phelan2,Yu Li2,Matthew Stone1,David Dahlbom1,Alexander Kolesnikov1,Duminda Sanjeewa3
Oak Ridge National Lab1,Argonne National Laboratory2,University of Missouri–Columbia3
Daniel Pajerowski1,Daniel Phelan2,Yu Li2,Matthew Stone1,David Dahlbom1,Alexander Kolesnikov1,Duminda Sanjeewa3
Oak Ridge National Lab1,Argonne National Laboratory2,University of Missouri–Columbia3
Ba<sub>3</sub>ZnRu<sub>2</sub>O<sub>9</sub> (BZRO) is a 6-H perovskite compound with layers of S=3/2 Ru<sup>5+</sup> dimers arranged in a triangular lattice. There is no evidence of long-range magnetic order at temperatures as low as 37 mK, which suggests a potential spin-liquid ground-state.[1] Inelastic neutron scattering results are presented from from BZRO (powder, crystal arrays) and the diamagnetically doped Ba<sub>3</sub>Zn(Ru<sub>0.1</sub>Sb<sub>0.9</sub>)2O<sub>9</sub>. The BZRO shows highly dispersive excitations with no magnetic Bragg peaks. So, contrary to prior suggestions that a similar compound, Ba<sub>3</sub>CaRu<sub>2</sub>O<sub>9</sub>, consists of magnetic dimers with negligible inter-dimer interactions,[2] these data show that BZRO clearly deviates from a dimer model. Different analysis techniques of the correlations are illustrated, including coarse-graining the system so that dimers are local entangled units.<br/><br/>[1] I. Terasaki, et al., J. Phys. Soc. Jpn. 86, 033702 (2017) [4 Pages]<br/><br/>[2] J. Darriet, et al., J. Phys. Chem. Solids 44 (1983) pp. 269-212.