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We used scanning tunneling microscopy and spectroscopy to study the electron-doped copper oxide compound Sr1\u2212xNdxCuO2, which has only bare cations separating the CuO2\u00a0planes and thus the simplest infinite-layer structure of all cuprate superconductors. Tunneling conductance spectra of the major CuO2 planes in the superconducting state revealed direct evidence for a nodeless pairing gap, regardless of variation of its magnitude with the local doping of trivalent neodymium. Furthermore, three distinct bosonic modes are observed as multiple peak-dip-hump features outside the superconducting gaps and their respective energies depend little on the spatially varying gaps. As well as the bosonic modes, with energies identical to those of the external, bending and stretching phonons of copper oxides, our findings reveal the origin of the bosonic modes in lattice vibrations rather than spin excitations.<\/jats:p>","DOI":"10.1093\/nsr\/nwab225","type":"journal-article","created":{"date-parts":[[2021,12,13]],"date-time":"2021-12-13T12:11:02Z","timestamp":1639397462000},"source":"Crossref","is-referenced-by-count":22,"title":["Direct observation of nodeless superconductivity and phonon modes in electron-doped copper oxide Sr1\u2212xNdxCuO2"],"prefix":"10.1093","volume":"9","author":[{"given":"Jia-Qi","family":"Fan","sequence":"first","affiliation":[{"name":"State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University , Beijing 100084 , China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xue-Qing","family":"Yu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Low-Dimensional 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