Quantum critical point in CuGeO3 doped with magnetic impurities
arXiv:cond-mat/0301595 · doi:10.1016/S0921-4526(02)02022-7
Abstract
Using high frequency (up to 450 GHz) ESR and low temperature specific heat measurements we find that insertion of 1% Fe and 2% Co damps spin-Peierls and Neel transitions and for T<30K gives rise to onset of a quantum critical behaviour characteristic for a random dimer Griffiths phase.
5 pages, 2 figures, to be published in Physica B