The in-plane thermal conductivity of the iron-based superconductor Ca10（Pt4δAs8）（（Fe1-xPtx）2As2）5 single crystal （＂10-4-8＂, Tc = 22 K） was measured down to 80 inK. In a zero field, the residual linear term ...The in-plane thermal conductivity of the iron-based superconductor Ca10（Pt4δAs8）（（Fe1-xPtx）2As2）5 single crystal （＂10-4-8＂, Tc = 22 K） was measured down to 80 inK. In a zero field, the residual linear term ro/T is negligible, suggesting the nodeless superconducting gaps in this multiband compound. In the magnetic fields, r0/T increases rapidly, which mimics the multiband superconductor NbSe2 and LuNi2B2C with highly anisotropic gap. Such a field dependence of K0/T is an evidence for the multiple superconducting gaps with quite different magnitudes or highly anisotropic gap. Compared with the London penetration depth results of the Ca10（Pt3As8）（（Fe1-xPtx）zAs2）5 （＂10-3-8＂） compound, the 10-4-8 and 10-3-8 compounds may have a similar superconducting gap structure.展开更多
基金supported by the National Basic Research Program of China(Grant No.2012CB821402)the National Natural Science Foundation of China(Grant Nos.11422429 and 91421101)+1 种基金the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learningthe Science and Technology Commission of Shanghai Municipality of China(Grant No.15XD1500200)
文摘The in-plane thermal conductivity of the iron-based superconductor Ca10（Pt4δAs8）（（Fe1-xPtx）2As2）5 single crystal （＂10-4-8＂, Tc = 22 K） was measured down to 80 inK. In a zero field, the residual linear term ro/T is negligible, suggesting the nodeless superconducting gaps in this multiband compound. In the magnetic fields, r0/T increases rapidly, which mimics the multiband superconductor NbSe2 and LuNi2B2C with highly anisotropic gap. Such a field dependence of K0/T is an evidence for the multiple superconducting gaps with quite different magnitudes or highly anisotropic gap. Compared with the London penetration depth results of the Ca10（Pt3As8）（（Fe1-xPtx）zAs2）5 （＂10-3-8＂） compound, the 10-4-8 and 10-3-8 compounds may have a similar superconducting gap structure.
