Static magnetic and ESR spectroscopic properties of the dimer-chain antiferromagnet BiCoPO5

M. Iakovleva, T. Petersen, A. Alfonsov, Y. Skourski, H.-J. Grafe, E. Vavilova, R. Nath, L. Hozoi, and V. Kataev
Phys. Rev. Materials 6, 094413 – Published 28 September 2022

Abstract

We report a comprehensive study of the static susceptibility, high-field magnetization and high-frequency/high-magnetic field electron spin resonance (HF-ESR) spectroscopy of polycrystalline samples of the bismuth cobalt oxyphosphate BiCoPO5. This compound features a peculiar spin system that can be considered as antiferromagnetic (AFM) chains built of pairs of ferromagnetically coupled Co spins and interconnected in all three spatial directions. It was previously shown that BiCoPO5 orders antiferromagnetically at TN10K and this order can be continuously suppressed by magnetic field towards the critical value μ0Hc15 T. In our experiments we find strongly enhanced magnetic moments and spectroscopic g factors as compared to the expected spin-only values, suggesting a strong contribution of orbital magnetism for the Co2+ ions. This is quantitatively confirmed by ab initio quantum chemical calculations. Within the AFM ordered phase, we observe a distinct field-induced magnetic phase transition. Its critical field rises to 6 T at TTN. The HF-ESR spectra recorded at TTN are very rich comprising up to six resonance modes possibly of the multimagnonic nature that soften towards the critical region around 6 T. Interestingly, we find that the Co moments are not yet fully polarized at Hc which supports a theoretical proposal identifying Hc as the quantum critical point for the transition of the spin system in BiCoPO5 to the quantum disordered state at stronger fields.

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  • Received 28 July 2022
  • Accepted 15 September 2022

DOI:https://doi.org/10.1103/PhysRevMaterials.6.094413

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Iakovleva1, T. Petersen1, A. Alfonsov1, Y. Skourski2, H.-J. Grafe1, E. Vavilova3, R. Nath4, L. Hozoi1, and V. Kataev1

  • 1Leibniz IFW Dresden, D-01069 Dresden, Germany
  • 2Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  • 3Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029 Kazan, Russia
  • 4School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram-695551, India

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Issue

Vol. 6, Iss. 9 — September 2022

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