Anisotropic magnetism of the Shastry-Sutherland lattice material BaNd₂PtO₅

Journal Article · Wed Jul 26 00:00:00 EDT 2023 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.7.074407· OSTI ID:1994680

Pasco, Christopher M. ^[1]; Rai, Binod K. ^[2]; Frontzek, Matthias D. ^[1]; Sala, Gabriele ^[1]; Stone, Matthew B. ^[1]; Chakoumakos, Bryan C. ^[1]; Garlea, Vasile Ovidiu ^[1]; Christianson, Andrew D. ^[1]; May, Andrew F. ^[1]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Savannah River National Laboratory (SRNL), Aiken, SC (United States)

For this work, single crystals were grown and characterized to investigate the physical properties and magnetic ground state of BaNd₂PtO₅, a candidate to host physics of the Shastry-Sutherland model. Analysis of single crystal x-ray diffraction data yields an updated crystal structure, similar to the prior report but now in space group P4/mbm. Magnetization and specific heat measurements reveal an antiferromagnetic transition at T_N=1.9K and a large magnetic anisotropy with in-plane magnetization much larger than out-of-plane magnetization. Single crystal neutron diffraction at zero field reveals a propagation vector of ($$\frac{1}{2}$$$$\frac{1}{2}$$$$\frac{1}{2}$$) for the magnetic ground state as compared to the ($$\frac{1}{2}$$$$\frac{1}{2}$$0) wave vector observed in the related body-centered material BaNd₂ZnO₅. The ground state is found to be a fully compensated antiferromagnet with diffraction data well fitted within the magnetic space group P_S–1 (BNS setting #2.7). The ordered moment is mostly in the basal plane with nearest neighbors forming ferromagnetic dimers, however it also has a finite out-of-plane component unlike the related easy-plane materials BaNd₂ZnO₅ and BaNd₂ZnS₅. Field-induced transitions are observed below T_N when the field is applied within the basal plane, and in-plane anisotropy of the associated critical fields is observed. The magnetization is strongly impacted by misalignment of the field away from high symmetry directions. These results suggest complex magnetic structures may arise in the field-induced states, and they highlight the need for extreme care when studying this and related Shastry-Sutherland materials.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1994680
• Journal Information: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 7 Vol. 7; ISSN 2475-9953
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
magnetic order