Quantum critical behavior induced by Mn impurity in CuGeO3

A. V. Semeno; N. E. Sluchanko; N. A. Samarin; A. A. Pronin; H. Ohta; S. Okubo; S. V. Demishev

doi:10.1016/j.physb.2006.01.046

Quantum critical behavior induced by Mn impurity in CuGeO3

Strongly Correlated Electrons 2009-11-11 v1

Authors: A. V. Semeno , N. E. Sluchanko , N. A. Samarin , A. A. Pronin , H. Ohta , S. Okubo , S. V. Demishev

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Abstract

Results of high frequency (60-315 GHz) studies of ESR in CuGeO3 single crystals containing 0.9% of Mn impurity are reported. Quantitative EPR line shape analysis allowed concluding that low temperature magnetic susceptibility for T <40 K diverges following power law with the critical exponent 0.81 and therefore manifests onset of a quantum critical (QC) regime. We argue that transition into Griffiths phase occurs at TG~40 K and disorder produced by Mn impurity in quantum spin chains of CuGeO3 may lead to co-existence of the QC regime and spin-Peierls dimerisation.

Keywords

quantum critical behavior Mn impurity CuGeO3 electron spin resonance Griffiths phase spin-Peierls dimerisation

Cite

@article{arxiv.cond-mat/0507365,
  title  = {Quantum critical behavior induced by Mn impurity in CuGeO3},
  author = {A. V. Semeno and N. E. Sluchanko and N. A. Samarin and A. A. Pronin and H. Ohta and S. Okubo and S. V. Demishev},
  journal= {arXiv preprint arXiv:cond-mat/0507365},
  year   = {2009}
}

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2 pages, submitted to SCES05 proceedings

Quantum critical behavior induced by Mn impurity in CuGeO3

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