paper

Nodeless superconducting gaps in Ca $_{10}$ (Pt $_{4 - I^´}$ As $_{8}$ )((Fe $_{1 - x}$ Pt $_{x}$ ) $_{2}$ As $_{2}$ ) $_{5}$ probed by quasiparticle heat transport

arXiv:1403.0194 · doi:10.1007/s11433-016-5780-1

Abstract

The in-plane thermal conductivity of iron-based superconductor Ca $_{10}$ (Pt $_{4 - I^´}$ As $_{8}$ )((Fe $_{1 - x}$ Pt $_{x}$ ) $_{2}$ As $_{2}$ ) $_{5}$ single crystal (``10-4-8", $T_{c}$ = 22 K) was measured down to 80 mK. In zero field, the residual linear term $I^º_{0} / T$ is negligible, suggesting nodeless superconducting gaps in this multiband compound. In magnetic fields, $I^º_{0} / T$ increases rapidly, which mimics those of multiband superconductor NbSe $_{2}$ and LuNi $_{2}$ B $_{2}$ C with highly anisotropic gap. Such a field dependence of $I^º_{0} / T$ is an evidence for multiple superconducting gaps with quite different magnitudes or highly anisotropic gap. Comparing with the London penetration depth results of Ca $_{10}$ (Pt $_{3}$ As $_{8}$ )((Fe $_{1 - x}$ Pt $_{x}$ ) $_{2}$ As $_{2}$ ) $_{5}$ (``10-3-8") compound, the 10-4-8 and 10-3-8 compounds may have similar superconducting gap structure.

5 pages, 4 figures

Nodeless superconducting gaps in Ca10​(Pt4−I^´​As8​)((Fe1−x​Ptx​)2​As2​)5​ probed by quasiparticle heat transport

Abstract

Nodeless superconducting gaps in Ca $_{10}$ (Pt $_{4 - I^´}$ As $_{8}$ )((Fe $_{1 - x}$ Pt $_{x}$ ) $_{2}$ As $_{2}$ ) $_{5}$ probed by quasiparticle heat transport