Observation of a transient magnetization plateau in a quantum antiferromagnet on the Kagomé lattice

Y. Narumi, K. Katsumata, Z. Honda, J. C. Domenge, P. Sindzingre, C. Lhuillier, Y. Shimaoka, T. C. Kobayashi, K. Kindo

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The magnetization process of an S = 1/2 antiferromagnet on the Kagomé lattice, [Cu3(titmb)2(OCOCH 3)6] · H2O{titmb = 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6 trimethylbenzene}, has been measured at very low temperatures in both pulsed and steady fields. We have found a new dynamical behavior in the magnetization process. A plateau at one third of the saturation magnetization Ms appears in the pulsed-field experiments for intermediate sweep rates of the magnetic field and disappears in the steady-field experiments. A theoretical analysis using exact diagonalization yields J1 = -19 ± 2 K and J2 = 6 ± 2 K, for the nearest-neighbor and second-nearest-neighbor interactions, respectively. This set of exchange parameters explains the very low saturation field and the absence of the plateau in the thermodynamic equilibrium as well as the two-peak feature in the magnetic heat capacity observed by Honda et al (Z. Honda et al., J. Phys. Condens. Matter, 14 (2002) L625). Supported by numerical results we argue that a dynamical order by disorder phenomenon could explain the transient appearance of the Ms/3 plateau in pulsed-field experiments.

Original languageEnglish
Pages (from-to)705-711
Number of pages7
JournalEurophysics Letters
Issue number5
Publication statusPublished - Mar 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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