Critical neutron scattering study of the compositional phase transition in Mg-doped CuGeO3

M. Nishi; H. Nakao; Y. Fujii; T. Masuda; K. Uchinokura; G. Shirane

doi:10.1143/JPSJ.69.3186

Critical neutron scattering study of the compositional phase transition in Mg-doped CuGeO3

Strongly Correlated Electrons 2009-10-31 v4 Materials Science

Authors: M. Nishi , H. Nakao , Y. Fujii , T. Masuda , K. Uchinokura , G. Shirane

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Abstract

Cu1-xMgxGeO3 undergoes a first-order phase transition at a critical concentration xc between an antiferromagnetic (AF) state on dimerized lattice (D-AF) and an AF Neel state on undistorted uniform lattice (U-AF). Previous magnetic susceptibility measurements showed xc = 0.023 while a recent neutron scattering study reported xc = 0.027 +- 0.001. The present critical scattering due to antiferromagnetic fluctuations near the superlattice reflection (0,1,1/2) unambiguously determines xc = 0.028 +- 0.001 at TN = 3.4 ~ 4 K. Also at T = 1.3 K, the phase boundary was determined as xc = 0.028 +- 0.001 by observation of a jump of an effective magnetic moment across xc.

Keywords

neutron scattering compositional phase transition CuGeO3 Mg-doped antiferromagnetic critical scattering superlattice reflection effective magnetic moment

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@article{arxiv.cond-mat/0002429,
  title  = {Critical neutron scattering study of the compositional phase transition in Mg-doped CuGeO3},
  author = {M. Nishi and H. Nakao and Y. Fujii and T. Masuda and K. Uchinokura and G. Shirane},
  journal= {arXiv preprint arXiv:cond-mat/0002429},
  year   = {2009}
}

Comments

8 pages,3 figures, Post Scripts, PACS numbers: 75.30.Kz, 75.40.-s, 61.12, 75.30.K. submitted to Journal of Physical Society of Japan

Critical neutron scattering study of the compositional phase transition in Mg-doped CuGeO3

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