skip to main content

DOE PAGESDOE PAGES

Title: Frustrated spin- 1 2 molecular magnetism in the mixed-valence antiferromagnets Ba 3 M Ru 2 O 9 ( M = In , Y, Lu)

We have performed magnetic susceptibility, heat capacity, muon spin relaxation, and neutron-scattering measurements on three members of the family Ba 3MRu 2O 9, 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.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [3] ;  [3] ; ORCiD logo [2] ; ORCiD logo [2] ;  [1] ;  [1]
  1. Univ. of Sherbrooke, Sherbrooke, QC (Canada). Inst. Quantique and Departement de Physique
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
AC05-00OR22725; DMR-1350002; DMR-1420451
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetic susceptibility; antiferromagnetic
OSTI Identifier:
1423110

Ziat, D., Aczel, Adam A., Sinclair, R., Chen, Q., Zhou, H. D., Williams, Travis J., Stone, Matthew B., Verrier, A., and Quilliam, J. A.. Frustrated spin- 12 molecular magnetism in the mixed-valence antiferromagnets Ba3MRu2O9(M=In , Y, Lu). United States: N. p., Web. doi:10.1103/PhysRevB.95.184424.
Ziat, D., Aczel, Adam A., Sinclair, R., Chen, Q., Zhou, H. D., Williams, Travis J., Stone, Matthew B., Verrier, A., & Quilliam, J. A.. Frustrated spin- 12 molecular magnetism in the mixed-valence antiferromagnets Ba3MRu2O9(M=In , Y, Lu). United States. doi:10.1103/PhysRevB.95.184424.
Ziat, D., Aczel, Adam A., Sinclair, R., Chen, Q., Zhou, H. D., Williams, Travis J., Stone, Matthew B., Verrier, A., and Quilliam, J. A.. 2017. "Frustrated spin- 12 molecular magnetism in the mixed-valence antiferromagnets Ba3MRu2O9(M=In , Y, Lu)". United States. doi:10.1103/PhysRevB.95.184424. https://www.osti.gov/servlets/purl/1423110.
@article{osti_1423110,
title = {Frustrated spin- 12 molecular magnetism in the mixed-valence antiferromagnets Ba3MRu2O9(M=In , Y, Lu)},
author = {Ziat, D. and Aczel, Adam A. and Sinclair, R. and Chen, Q. and Zhou, H. D. and Williams, Travis J. and Stone, Matthew B. and Verrier, A. and Quilliam, J. A.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.95.184424},
journal = {Physical Review B},
number = 18,
volume = 95,
place = {United States},
year = {2017},
month = {5}
}