2014/07/27 by Xiaochen Hong, X. C. Hong, Z. Zhang +12
Materials Science · Physics and Astronomy · #Chalcogenide #Condensed matter physics #Electrical resistivity and conductivity #Iron-based superconductors research #Materials science #Metallurgy #Nickel #Physics #Quantum mechanics #Quasiparticle #Rare-earth and actinide compounds #Residual resistivity #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.90.060504
published as Phys. Rev. B 90, 060504(R) (2014) · 5 pages, 3 figures
arxiv created 2014/07/27 · openalex publication_date 2014/08/18 · arxiv updated 2015/06/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Low-temperature thermal conductivity measurements were performed on single crystals of TlNi2Se2, a nickel chalcogenide heavy-electron superconductor with Tc\ensuremath≃3.7 K. In zero field, the residual electronic contribution at T\ensuremath→0 K (\ensuremathκ0/T) was well separated from the total thermal conductivity, which is less than 0.45% of its normal-state value. Such a tiny residual \ensuremathκ0/T is unlikely contributed by the nodal quasiparticles. The nodeless gap structure is supported by the very weak field dependence of \ensuremathκ0(H)/T in low magnetic fields. In the whole field range, \ensuremathκ0(H)/T exhibits an S-shaped curve, as in the case of nickel pnictides BaNi2As2 and SrNi2P2. This common feature of nickel-based superconductors can be explained by multiple nodeless superconducting gaps.