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Thermal conductivity, point contact spectroscopy, angle-resolvedphotoemission and Raman spectroscopy measurements were performed onBaFe1.9Pt0.1As2 single crystals obtained from the same synthesis batch in orderto investigate the superconducting energy gap structure using multipletechniques. Low temperature thermal conductivity was measured in thesuperconducting state as a function of temperature and magnetic field,revealing an absence of quasiparticle excitations in the T=0 limit up to 15 Tapplied magnetic fields. Point-contact Andreev reflection spectroscopymeasurements were performed as a function of temperature using the needle-anviltechnique, yielding features in the conductance spectra at both 2.5 meV and 7.0meV scales consistent with a multi-gap scenario. Angle-resolved photoemissionspectroscopy probed the electronic band structure above and below thesuperconducting transition temperature of T_c=23 K, revealing an isotropic gapof magnitude ~3 meV on both electron and hole pockets. Finally, Ramanspectroscopy was used to probe quasiparticle excitations in multiple channels,showing a threshold energy scale of 3 meV below T_c. Overall, we find strongevidence for an isotropic gap structure with no nodes or deep minima in thissystem, with a 3 meV magnitude gap consistently observed and a second, largergap suggested by point contact spectroscopy measurements. We discuss theimplications that the combination of these results reveal about thesuperconducting order parameter in the BaFe1-xPtxAs2 system and how thisrelates to similar substituted iron pnictides.

Isotropic multi-gap superconductivity in BaFe1.9Pt0.1As2 from thermal transport and spectroscopic measurements