2009/06/02 by Y. Machida, Yo Machida, K. Tomokuni +9 · 3 citations
Materials Science · Physics and Astronomy · #Impurity #Iron-based superconductors research #Pairing #Physics of Superconductivity and Magnetism #Quasiparticle #Superconductivity #Superconductivity in MgB2 and Alloys #Symmetry (geometry) #Thermal #Thermal Hall effect #Thermal conductivity #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.78.073705
published as J. Phys. Soc. Jpn. 78, 073705 (2009) · 4 pages, 4 figures, to be published in Journal of the Physical Society of Japan
arxiv created 2009/06/02 · openalex publication_date 2009/07/10 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Thermal transport measurements have been performed on single-crystalline Co-doped BaFe2As2 down to 0.1 K and under magnetic fields up to 7 T. Significant peak anomalies are observed in both thermal conductivity and thermal Hall conductivity below Tc as an indication of the enhancement of the quasiparticle mean-free path. Moreover, we find a sizable residual T-linear term in thermal conductivity, possibly due to a finite quasiparticle density of states in the superconducting gap induced by impurity pair breaking. Our findings support a pairing symmetry compatible with the theoretically predicted sign-reversing s-wave state.