Excitations in Spin Chains and Specific-Heat Anomalies in Yb(4)As(3)

Burkhard Schmidt; Peter Thalmeier; Peter Fulde

doi:10.1209/epl/i1996-00540-7

Excitations in Spin Chains and Specific-Heat Anomalies in Yb(4)As(3)

Condensed Matter 2009-10-28 v1

Authors: Burkhard Schmidt , Peter Thalmeier , Peter Fulde

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Abstract

An explanation is given for the observed magnetic-field dependence of the low-temperature specific heat coefficient of Yb(4)As(3). It is based on a recently developed model for that material which can explain the observed heavy-fermion behaviour. According to it the Yb(3+)-ions are positioned in a net of parallel chains with an effective spin coupling of the order of J = 25 K. The magnetic-field dependence can be understood by including a weak magnetic coupling J' between adjacent chains. The data require a ratio J'/J of about 10^{-4}. In that case the experimental results can be reproduced very well by the theory.

Keywords

heavy fermions spin chains specific heat Yb4As3 magnetic field dependence effective spin coupling

Cite

@article{arxiv.cond-mat/9603055,
  title  = {Excitations in Spin Chains and Specific-Heat Anomalies in Yb(4)As(3)},
  author = {Burkhard Schmidt and Peter Thalmeier and Peter Fulde},
  journal= {arXiv preprint arXiv:cond-mat/9603055},
  year   = {2009}
}

Comments

5 pages, 5 PostScript-figures, needs LaTeX2e and the graphics-package

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