Abstract
Thermal transport measurements have been made on the Fe-based superconductor () down to a very low temperature . The field and temperature dependences of the thermal conductivity confirm the multigap superconductivity with fully opened gaps on the whole Fermi surfaces. In comparison to , reveals a remarkably enhanced quasiparticle heat conduction in the mixed state. The results can be interpreted as a consequence of the unequal weight of the Fe -electron character among the distinct bands.
- Received 13 September 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.107002
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