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19 April 2024

» arxiv » cond-mat/0110177

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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 ;
Date:	9 Oct 2001
Subject:	Strongly Correlated Electrons \| cond-mat.str-el
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.
Source:	arXiv, cond-mat/0110177
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