Decay of spin-Peierls state in CuGeO3:Fe. The case of a strong disorder
Demishev, S. V. · Bunting, R. V. · Pronin, A. A. · Sluchanko, N. E. · Samarin, N. A. · Ohta, H. · Okubo, S. · Oshima, Y. · Leonyuk, L. I. · Markina, M. M.
Original · EN
Influence of doping by iron impurity on spin-Peierls state in CuGeO3 is studied. ESR measurements for the frequency/temperature domain 60-450 GHz/ 1.8-300 K and specific heat data obtained for the interval 6-20 K show that insertion of 1% of Fe completely destroy both spin-Peierls and antiferromagnetic orders. Damping of long-range magnetic order is accompanied by onset at T<20 K of power asymptotics for magnetic susceptibility chi T-alpha and magnetic part of specific heat cm T(1-alpha), with the index alpha=0.35-0.37. This effect is characteristic to the limit of strong disorder for doped CuGeO3 and may reflect formation of the Griffiths phase at low temperatures in CuGeO3:Fe.
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