Anisotropic magnetic response of BaCo<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>
ORAL
Abstract
Quantum spin liquid (QSL) is an exotic state of matter predicted to refrain from forming long-range magnetic order down to absolute zero temperature. However, the non-Kitaev interactions in the explored candidate materials lead to the presence of an unconventional magnetically ordered state, which can be suppressed by applying an external magnetic field to push the system towards a QSL state. Recently, theoretical studies suggested that Co-based compounds, such as BaCo2(AsO4)2, have a high potential to be Kitaev QSLs. The required field needed to suppress the magnetic order in BaCo2(AsO4)2 is about 0.5T for the in-plane fields. Above this field, the magnetic state that emerges is not well understood, as is also the case for RuCl3.
Our main objective is to investigate the magnetic anisotropy of BaCo2(AsO4)2 to clarify the magnetic phases both within the AFM phase, as well as nearby. By vibrating small single crystals of BaCo2(AsO4)2 in a magnetic field, we study the rotational robustness of its magnetism- magnetotropic coefficient [1,2]. Our preliminary data illustrates the field-angle variation of the AFM suppression field, as well as the angle dependence of the low-field spin textures. Studies beyond the AFM phase will be compared to similar measurements in RuCl3 to determine the likelihood that BaCo2(AsO4)2 hosts a QSL.
Our main objective is to investigate the magnetic anisotropy of BaCo2(AsO4)2 to clarify the magnetic phases both within the AFM phase, as well as nearby. By vibrating small single crystals of BaCo2(AsO4)2 in a magnetic field, we study the rotational robustness of its magnetism- magnetotropic coefficient [1,2]. Our preliminary data illustrates the field-angle variation of the AFM suppression field, as well as the angle dependence of the low-field spin textures. Studies beyond the AFM phase will be compared to similar measurements in RuCl3 to determine the likelihood that BaCo2(AsO4)2 hosts a QSL.
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Publication: [1] Modic, K.A., Bachmann, M.D., Ramshaw, B.J. et al. Resonant torsion magnetometry in anisotropic quantum materials. Nat Commun 9, 3975 (2018)<br>[2] Shekhter, A., et al. "The magnetotropic susceptibility." arXiv preprint arXiv:2208.10038 (2022).<br>
Presenters
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Shiva Safari
Institute of Science and Technology Aust
Authors
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Shiva Safari
Institute of Science and Technology Aust