Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Frustrated Magnets
MA 16.9: Vortrag
Dienstag, 6. September 2022, 17:00–17:15, H37
Single crystal study of the magnetic phase diagrams in BaCo2(PO4)2 — •Xiao Wang1, Rohit Sharma1, Petra Becker-Bohatý2, Ladislav Bohatý2, and Thomas Lorenz1 — 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany — 2Abteilung Kristallographie, Institut für Geologie und Mineralogie, Universität zu Köln, Zülpicher Straße 49b, 50674 Köln, Germany
The study of the Kitaev materials has been an active area in the past decades, mainly motivated by their novel physical properties such as topological order, exotic excitations and potential application for quantum computing . Motived by recent theoretical proposals that Kitaev model might be realized in 3d transition-metal compounds , we have successfully synthesized single crystal samples of BaCo2(PO4)2. Our work on the high-quality BaCo2(PO4)2 sample unveils a sharp phase transition at ∼3.5K which signals the evolution of antiferromagnetic long-range order in zero magnetic field. Such a transition is not observed in previous studies on polycrystalline BaCo2(PO4)2 [3], while for a TN = 5.4 K is reported for BaCo2(AsO4)2 [4]. Here we present a comprehensive study of the magnetic phase transitions by magnetization, specific heat and thermal expansion measurements and construct the magnetic phase diagram of BaCo2(PO4)2. This work is funded by the DFG via CRC 1238 Projects A02 and B01.
[1] A. Kitaev, Ann. Phys. (N. Y). 321, 2 (2006) [2] H. Liu, et al. Phys. Rev. Lett. 125, 3 (2020) [3] H. S. Nair, et al. Phys. Rev. B 97, 1 (2018) [4] R. Zhong, et al. Sci. Adv. 6, 1 (2020)