Decay of spin-Peierls state in CuGeO3:Fe. The case of a strong disorder
S. V. Demishev, R. V. Bunting, A. A. Pronin, N. E. Sluchanko, N. A. Samarin, H. Ohta, S. Okubo, Y. Oshima, L. I. Leonyuk, M. M. Markina
Abstract
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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