Crystal growth and magnetic properties of atom K embedded in Na5Co15.5Te6O36

• Published in: Journal of magnetism and magnetic materials Vol. 608; p. 172412
• Main Authors: Ma, C.C., Liu, C.B., Chen, R., Jin, S.J., Zhang, H.S., Cheng, J.B., He, J.B., Chen, Y.Q., Ma, S.S., Luo, Y.S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-10-2024
• Subjects: Abnormal hysteresis loop; Ferromagnetic correlation; Kagome lattice; Ferromagnetic correlation; Abnormal hysteresis loop; Kagome lattice
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2024.172412

•Single-crystal samples were prepared using a new methodology.•The compound can be regarded as a new system charactered by the K atom embedded in the Kagome system Na5Co15.5Te6O36.•Magnetization measurements reveal ferromagnetic correlations and an enhanced abnormal hysteresis loop.
In this paper, we report the structural, magnetic and specific heat properties of a new compound Na2.67K1.33Pb0.67Co15.33Te6O36 (NKPCTO). The compound can be regarded as a new system charactered by the K and Pb atom embedded in the Kagome system Na5Co15.5Te6O36 (NCTO). In the new structure, we find that the disordered occupations of the Na and Co(3) atoms is irrelevant to K atom site, and Pb has same site with K. The ground state is proposed to have an effective S = 1/2 due to the 3d7 Co2+ ion in octahedral coordination and considerable spin–orbit coupling. Magnetic and specific heat data uncover that only an antiferromagnetic phase transition develops in NKPCTO at 49 K. There are also ferromagnetic correlations above the Neel temperature, as well as anomalous hysteresis loops and multiple field-induced magnetic transitions at low temperatures.