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Interrogating the superconductor Ca 10 (Pt 4 As 8 )(Fe 2-x Pt x As 2 ) 5 Layer-by-layer.

Scientific Reports 2016 October 15
Ever since the discovery of high-Tc superconductivity in layered cuprates, the roles that individual layers play have been debated, due to difficulty in layer-by-layer characterization. While there is similar challenge in many Fe-based layered superconductors, the newly-discovered Ca10 (Pt4 As8 )(Fe2 As2 )5 provides opportunities to explore superconductivity layer by layer, because it contains both superconducting building blocks (Fe2 As2 layers) and intermediate Pt4 As8 layers. Cleaving a single crystal under ultra-high vacuum results in multiple terminations: an ordered Pt4 As8 layer, two reconstructed Ca layers on the top of a Pt4 As8 layer, and disordered Ca layer on the top of Fe2 As2 layer. The electronic properties of individual layers are studied using scanning tunneling microscopy/spectroscopy (STM/S), which reveals different spectra for each surface. Remarkably superconducting coherence peaks are seen only on the ordered Ca/Pt4 As8 layer. Our results indicate that an ordered structure with proper charge balance is required in order to preserve superconductivity.

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