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Interrogating the superconductor Ca10(Pt4As8)(Fe2-xPtxAs2)5 Layer-by-layer.

ABSTRACT: 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(Pt4As8)(Fe2As2)5 provides opportunities to explore superconductivity layer by layer, because it contains both superconducting building blocks (Fe2As2 layers) and intermediate Pt4As8 layers. Cleaving a single crystal under ultra-high vacuum results in multiple terminations: an ordered Pt4As8 layer, two reconstructed Ca layers on the top of a Pt4As8 layer, and disordered Ca layer on the top of Fe2As2 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/Pt4As8 layer. Our results indicate that an ordered structure with proper charge balance is required in order to preserve superconductivity.

SUBMITTER: Kim J 

PROVIDER: S-EPMC5064410 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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

Kim Jisun J   Nam Hyoungdo H   Li Guorong G   Karki A B AB   Wang Zhen Z   Zhu Yimei Y   Shih Chih-Kang CK   Zhang Jiandi J   Jin Rongying R   Plummer E W EW  

Scientific reports 20161014

Ever since the discovery of high-T<sub>c</sub> 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 Ca<sub>10</sub>(Pt<sub>4</sub>As<sub>8</sub>)(Fe<sub>2</sub>As<sub>2</sub>)<sub>5</sub> provides opportunities to explore superconductivity layer by layer, because it contains both superconducting building b  ...[more]

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