The thermal transport measurements have been made on the Fe-based superconductor Lu2Fe3Si5 (Tc ~ 6 K) down to a very low temperature Tc/120. 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 MgB2 as a typical example of the multigap superconductor in a p-electron system, Lu2Fe3Si5 reveals a remarkably enhanced quasiparticle heat conduction in the mixed state. The results can be interpreted as a consequence of the electronic correlations derived from Fe 3d-electrons.
@article{arxiv.1009.2432,
title = {Enhanced quasiparticle heat conduction of the multigap superconductor Lu2Fe3Si5},
author = {Y. Machida and S. Sakai and K. Izawa and H. Okuyama and T. Watanabe},
journal= {arXiv preprint arXiv:1009.2432},
year = {2015}
}