title: Enhanced quasiparticle heat conduction in the multigap superconductor Lu2Fe3Si5 .
abstract: Thermal transport measurements have been made on the Fe-based superconductor Lu2Fe3Si5 (T(c) ∼ 6  K) down to a very low temperature T(c)/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, Lu2Fe3Si5 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 3d-electron character among the distinct bands.
authors.affiliation: Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Machida
authors.forename: S
authors.initials: S
authors.lastname: Sakai
authors.forename: K
authors.initials: K
authors.lastname: Izawa
authors.forename: H
authors.initials: H
authors.lastname: Okuyama
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
mesh_terms: D058085:Iron Compounds / Q000737:chemistry*; D008187:Lutetium / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D017655:Silicon Compounds / Q000737:chemistry*; D013696:Temperature; D013814:Thermal Conductivity
chemical_list: D058085:Iron Compounds; D017655:Silicon Compounds; D008187:Lutetium; D012825:Silicon