Tunneling microscopy and spectroscopy reveal the simplest infinite-layer structure among all cuprate superconductors

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Strongly Correlated Electrons

Tunneling microscopy and spectroscopy reveal the simplest infinite-layer structure among all cuprate superconductors

Direct observation of nodeless superconductivity and phonon modes in electron-doped copper oxide Sr$_{1-x}$Nd$_x$CuO$_2$

We report on a scanning tunneling microscopy and spectroscopic study of an electron-doped copper oxide compound that has only bare cations separating the major planes in the superconducting state and thus the simplest infinite-layer structure among all cuprate superconductors.

Tunneling conductance spectra of the major planes in the superconducting state reveal 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.

Our findings indicate their origin from lattice vibrations rather than spin excitations.

Authors

Jia-Qi Fan, Xue-Qing Yu, Fang-Jun Cheng, Heng Wang, Ruifeng Wang, Xiaobing Ma, Xiao-Peng Hu, Ding Zhang, Xu-Cun Ma, Qi-Kun Xue, Can-Li Song

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