Nodeless superconducting gaps in Ca10(Pt(4-δ)As8)((Fe(1-x)Ptx)2As2)5 probed by quasiparticle heat transport  

作　　者：Xun Qiu LanPo He XiaoChen Hong ZhenZhang Jian Pan XiaoPing Shen DongLai Feng ShiYan Li 

机构地区：[1]State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China [2]Shanghai Institute of Space Power Source, Shanghai 200245, China [3]Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2016年第5期16-20,共5页中国科学：物理学、力学、天文学（英文版）

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);the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning;the Science and Technology Commission of Shanghai Municipality of China(Grant No.15XD1500200)

摘　　要：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.The in-plane thermal conductivity of the iron-based superconductor Ca10(Pt_(4-δ)As_8)((Fe_(1-x)Pt_x)_2As_2)_5 single crystal("10-4-8", T c= 22 K) was measured down to 80 m K. In a zero field, the residual linear term κ_0/T is negligible, suggesting the nodeless superconducting gaps in this multiband compound. In the magnetic fields, κ_0/T increases rapidly, which mimics the multiband superconductor Nb Se_2 and Lu Ni_2B_2 C with highly anisotropic gap. Such a field dependence of κ_0/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(Pt_(4-δ)As_8)((Fe_(1-x)Pt_x)_2As_2)_5("10-3-8") compound, the 10-4-8 and 10-3-8 compounds may have a similar superconducting gap structure.

关 键 词：iron-based superconductors thermal conductivity superconducting gap structure 

分 类 号：O511.3[一般工业技术—材料科学与工程]