Physics – Condensed Matter – Superconductivity
Scientific paper
2012-01-16
Physics
Condensed Matter
Superconductivity
Figure added that shows rapid rate of suppression of Tc with impurity scattering, in agreement with d-wave symmetry. 4 pages,
Scientific paper
The thermal conductivity of the iron-arsenide superconductor KFe2As2 was measured down to 50 mK for a heat current parallel and perpendicular to the tetragonal c axis. A residual linear term (RLT) at T = 0 is observed for both current directions, confirming the presence of nodes in the superconducting gap. Our value of the RLT in the plane is equal to that reported by Dong et al. [Phys. Rev. Lett. 104, 087005 (2010)] for a sample whose residual resistivity was ten times larger. This independence of the RLT on impurity scattering is the signature of universal heat transport, a property of superconducting states with symmetry-imposed line nodes. This argues against an s-wave state with accidental nodes. It favors instead a d-wave state, an assignment consistent with five additional properties: the magnitude of the critical scattering rate for suppressing Tc to zero; the magnitude of the RLT, and its dependence on current direction and on magnetic field; the temperature dependence of the thermal conductivity.
de Cotret Rene S.
Doiron-Leyraud Nicolas
Eisaki Hiroshi
Fukazawa Hedeto
Gordon R. T.
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