Low-temperature thermal conductivity of BaFe2As2: Parent compound of iron-arsenide superconductors

Details Low-temperature thermal conductivity of BaFe2As2: Parent compound of iron-arsenide superconductors Low-temperature thermal conductivity of BaFe2As2: Parent compound of iron-arsenide superconductors

2009-04-28

arxiv.org/abs/0904.4470v3

Physical Review B 79, 214439 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

We report low-temperature thermal conductivity down to 40 mK of the antiferromagnet BaFe$_2$As$_{2}$, which is the parent compound of recently discovered iron-based superconductors. In the investigated temperature range below 4 K, the thermal conductivity $\kappa$ is well described by the expression $\kappa$ = $aT$ + $bT^{2.22}$. We attribute the ``$aT$''-term to an electronic contribution which is found to satisfy the Wiedemann-Franz law in the $T$ $\to$ 0 K limit, and the remaining thermal conductivity, $\sim$ $T^{2.22}$, is attributed to phonon conductivity. A small influence on thermal conductivity by magnetic fields up to 8 T is well accounted by the observed magnetoresistance. The result is consistent with a fully gapped magnon spectrum, inferred previously from inelastic neutron scattering measurements.

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