Spin Glass State in S=3/2 Kagomé Antiferromagnet Co(N3)2(bpg)[(CH3)2(NCOH)]4/3

P. Vrábela, E. Čižmárb, A. Orendáčováb, S. Gaoc, M. Orendáčb aDepartment of Physics, Faculty of Electrical Engineering and Informatics, Letná 9, 042 00 Košice, Slovakia bInstitute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia cState Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing, 100871, China

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Specific heat, magnetic susceptibility and magnetization of Co(N3)2(bpg)[(CH3)2(NCOH)]4/3, representing S=3/2 kagomé system are reported. Long-range ordering at 16 K was revealed, however, at lower temperatures slow spin dynamics is still found. The analysis of alternating susceptibility suggests the onset of glassy state. The study of the time dependence of magnetization revealed the existence of more relaxation channels with pronounced different relaxation times. The observed behaviour is consistent with the formation of topological spin glass in which relaxation is governed by both spin and chiral degrees of freedom.

DOI: 10.12693/APhysPolA.126.266 PACS numbers: 75.50.Ee, 75.30.Et, 75.10.Nr