Decay of spin-Peierls state in CuGeO3:Fe. The case of a strong disorder

Details Decay of spin-Peierls state in CuGeO3:Fe. The case of a strong disorder Decay of spin-Peierls state in CuGeO3:Fe. The case of a strong disorder

2001-10-09

arxiv.org/abs/cond-mat/0110177v1

Physics

Condensed Matter

Strongly Correlated Electrons

Zipped TeX file (5 pages) + 5 EPS figures, submitted to Phys. Rev. B

Scientific paper

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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