Acta Physica Polonica B

Vol. 34, No. 2, February 2003, page 729

Quantum Critical Behaviour in CuGeO3

S.V. Demishev, A.A. Pronin, N.E. Sluchanko, N.A. Samarin, V.V. Glushkov, Y. Inagaki, H. Ohta, S. Okubo, Y. Oshima, M.M. Markina

From high frequency (up to 450 GHz) ESR and low temperature specific heat measurements we find that insertion of 1% Fe and 2% Co in CuGeO3 matrix smears both spin-Peierls and Neel transitions. For T<30 K we discovered an onset of the power asymptotics of magnetic susceptibility and specific heat characteristic to a quantum critical behaviour.

PACS numbers: 76.30.--v, 75.40.--s, 75.50.Lk

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