Frustrated spin- 12 molecular magnetism in the mixed-valence antiferromagnets Ba3MRu2O9(M=In , Y, Lu)

Ziat, D.; Aczel, Adam A.; Sinclair, R.; Chen, Q.; Zhou, H. D.; Williams, Travis J.; Stone, Matthew B.; Verrier, A.; Quilliam, J. A.

doi:10.1103/PhysRevB.95.184424

Frustrated spin- $\frac{1}{2}$ molecular magnetism in the mixed-valence antiferromagnets ${Ba}_{3} M {Ru}_{2} O_{9} (M = In$ , Y, Lu)

Journal Article · Mon May 22 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.184424· OSTI ID:1423110

Ziat, D. ^[1]; ^[2]; Sinclair, R. ^[3]; Chen, Q. ^[3]; Zhou, H. D. ^[3]; ^[2]; ^[2]; Verrier, A. ^[1]; Quilliam, J. A. ^[1]

Univ. of Sherbrooke, Sherbrooke, QC (Canada). Inst. Quantique and Departement de Physique
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy

We have performed magnetic susceptibility, heat capacity, muon spin relaxation, and neutron-scattering measurements on three members of the family Ba₃MRu₂O₉, where M=In, Y, and Lu. These systems consist of mixed-valence Ru dimers on a triangular lattice with antiferromagnetic interdimer exchange. Although previous work has argued that charge order within the dimers or intradimer double exchange plays an important role in determining the magnetic properties, our results suggest that the dimers are better described as molecular units due to significant orbital hybridization, resulting in one spin-1/2 moment distributed equally over the two Ru sites. These molecular building blocks form a frustrated, quasi-two-dimensional triangular lattice. Our zero- and longitudinal-field μSR results indicate that the molecular moments develop a collective, static magnetic ground state, with oscillations of the zero-field muon spin polarization indicative of long-range magnetic order in the Lu sample. In conclusion, the static magnetism is much more disordered in the Y and In samples, but they do not appear to be conventional spin glasses.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1423110

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 95; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Models and Materials for Generalized Kitaev Magnetism Winter, Stephen M.; Tsirlin, Alexander A.; Daghofer, Maria arXiv https://doi.org/10.48550/arxiv.1706.06113	text	January 2017

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