Enhanced quasiparticle heat conduction of the multigap superconductor Lu2Fe3Si5

Details Enhanced quasiparticle heat conduction of the multigap superconductor Lu2Fe3Si5 Enhanced quasiparticle heat conduction of the multigap superconductor Lu2Fe3Si5

2010-09-13

arxiv.org/abs/1009.2432v1

Phys. Rev. Lett. 106, 107002 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

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.

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