2006/10/05 by H. Shakeripour, M. A. Tanatar, S. Y. Li +3 · 2 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.99.187004
published as Phys. Rev. Lett. 99, 187004 (2007) · 4 pages, 3 figures, submitted to Phys. Rev. Lett
arxiv created 2006/10/05 · openalex publication_date 2007/10/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The thermal conductivity \ensuremathκ of the heavy-fermion superconductor CeIrIn5 was measured as a function of temperature down to Tc/8, for current directions parallel (J\ensuremath∥c) and perpendicular (J\ensuremath∥a) to the tetragonal c axis. For J\ensuremath∥a, a sizable residual linear term \ensuremathκ0/T is observed, as previously, which confirms the presence of line nodes in the superconducting gap. For J\ensuremath∥c, on the other hand, \ensuremathκ/T\ensuremath→0 as T\ensuremath→0. The resulting precipitous decline in the anisotropy ratio \ensuremathκc/\ensuremathκa at low temperature rules out a gap structure with line nodes running along the c axis, such as the d-wave state favored for CeCoIn5, and instead points to a hybrid gap of Eg symmetry.