Low-temperature thermal conductivity of BaFe2As2: A parent compound of iron arsenide superconductors
N. Kurita, F. Ronning, C. F. Miclea, E. D. Bauer, J. D. Thompson, A. S. Sefat, M. A. McGuire, B. C. Sales, D. Mandrus, R. Movshovich
DOI 10.1103/PhysRevB.79.214439 · Physical Review B
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Abstract
We report low-temperature thermal conductivity down to 40 mK of the antiferromagnet BaFe2As2, which is the parent compound of recently discovered iron-based superconductors. In the investigated temperature range below 4 K, the thermal conductivity κ is well described by the expression κ=aT+bT2.22. We attribute the “aT”-term to an electronic contribution which is found to satisfy the Wiedemann-Franz law in the T→0 K limit and the remaining thermal conductivity, ∼T2.22, 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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