Widely spaced planes of magnetic dimers in the Ba6 Y2Rh2Ti2 O17-δ hexagonal perovskite

Loi T. Nguyen; Daniel B. Straus; Q. Zhang; R. J. Cava

doi:10.1103/PhysRevMaterials.5.034419

Widely spaced planes of magnetic dimers in the Ba6 Y2Rh2Ti2 O17-δ hexagonal perovskite

Loi T. Nguyen, Daniel B. Straus, Q. Zhang, R. J. Cava

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Abstract

We report the synthesis and initial characterization of Ba6Y2Rh2Ti2O17-δ, a previously unreported material, to the best of our knowledge, with a hexagonal symmetry structure. Face-sharing RhO6 octahedra form triangular planes of Rh2O9 dimers that are widely separated in the perpendicular direction. The material displays a small effective magnetic moment, due to the Rh ions present, and a negative Curie-Weiss temperature. The charge transport and optical band gaps are very similar, near 0.16 eV. A large upturn in the heat capacity at temperatures below 1 K, suppressed by applied magnetic fields larger than μ0H=2T, is observed. A large T-linear term in the specific heat (γ=166mJ/molf.uK2) is seen, although the material is insulating at low temperatures. These results suggest the possibility of a spin liquid ground state in this material.

Original language	English
Article number	034419
Journal	Physical Review Materials
Volume	5
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevMaterials.5.034419
State	Published - Mar 2021

Funding

The authors acknowledge the use of Princeton's Imaging and Analysis Center, which is partially supported by the Princeton Center for Complex Materials, a National Science Foundation (NSF)-MRSEC program (Grant No. DMR-1420541). All of the research reported here was supported by the Institute of Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0019331. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
National Science Foundation
U.S. Department of Energy
Directorate for Mathematical and Physical Sciences	1420541
Office of Science
Basic Energy Sciences	DE-SC0019331
Oak Ridge National Laboratory
Materials Research Science and Engineering Center, Harvard University	DMR-1420541
Princeton Center for Complex Materials

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10.1103/PhysRevMaterials.5.034419

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title = "Widely spaced planes of magnetic dimers in the Ba6 Y2Rh2Ti2 O17-δ hexagonal perovskite",

abstract = "We report the synthesis and initial characterization of Ba6Y2Rh2Ti2O17-δ, a previously unreported material, to the best of our knowledge, with a hexagonal symmetry structure. Face-sharing RhO6 octahedra form triangular planes of Rh2O9 dimers that are widely separated in the perpendicular direction. The material displays a small effective magnetic moment, due to the Rh ions present, and a negative Curie-Weiss temperature. The charge transport and optical band gaps are very similar, near 0.16 eV. A large upturn in the heat capacity at temperatures below 1 K, suppressed by applied magnetic fields larger than μ0H=2T, is observed. A large T-linear term in the specific heat (γ=166mJ/molf.uK2) is seen, although the material is insulating at low temperatures. These results suggest the possibility of a spin liquid ground state in this material.",

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AB - We report the synthesis and initial characterization of Ba6Y2Rh2Ti2O17-δ, a previously unreported material, to the best of our knowledge, with a hexagonal symmetry structure. Face-sharing RhO6 octahedra form triangular planes of Rh2O9 dimers that are widely separated in the perpendicular direction. The material displays a small effective magnetic moment, due to the Rh ions present, and a negative Curie-Weiss temperature. The charge transport and optical band gaps are very similar, near 0.16 eV. A large upturn in the heat capacity at temperatures below 1 K, suppressed by applied magnetic fields larger than μ0H=2T, is observed. A large T-linear term in the specific heat (γ=166mJ/molf.uK2) is seen, although the material is insulating at low temperatures. These results suggest the possibility of a spin liquid ground state in this material.

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Widely spaced planes of magnetic dimers in the Ba6 Y2Rh2Ti2 O17-δ hexagonal perovskite

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