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Anomalous Dome-like Superconductivity in RE2(Cu1-xNix)5As3O2 (RE = La, Pr, Nd).

ABSTRACT: A significant manifestation of interplay of superconductivity and charge density wave, spin density wave, or magnetism is a dome-like superconducting critical temperature (Tc) in cuprate, iron-based, and heavy Fermion superconductors. Pesudogap, quantum critical point, and strange metals emerge in different doping ranges. Exploring dome-like Tc in new superconductors is of interest to detect emergent effects. Here we report the superconductivity in a new layered Cu-based compound RE2Cu5As3O2 (RE = La, Pr, Nd), in which the Tc exhibits dome-like variation with a maximum Tc of 2.5, 1.2, and 1.0 K with substitution of Cu by large amount of Ni ions. Simultaneously, the structural parameters like As-As bond length and c/a ratio exhibit unusual variations as the Ni-doping level goes through the optimal value. The robustness of superconductivity, up to 60% of Ni doping, reveals the unexpected impurity effect on inducing and enhancing superconductivity in these novel layered materials.

SUBMITTER: Chen X 

PROVIDER: S-EPMC6460253 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Anomalous Dome-like Superconductivity in RE<sub>2</sub>(Cu<sub>1-x</sub>Ni<sub>x</sub>)<sub>5</sub>As<sub>3</sub>O<sub>2</sub> (RE = La, Pr, Nd).

Chen Xu X   Guo Jiangang J   Gong Chunsheng C   Cheng Erjian E   Le Congcong C   Liu Ning N   Ying Tianping T   Zhang Qinghua Q   Hu Jiangping J   Li Shiyan S   Chen Xiaolong X  

iScience 20190329

A significant manifestation of interplay of superconductivity and charge density wave, spin density wave, or magnetism is a dome-like superconducting critical temperature (T<sub>c</sub>) in cuprate, iron-based, and heavy Fermion superconductors. Pesudogap, quantum critical point, and strange metals emerge in different doping ranges. Exploring dome-like T<sub>c</sub> in new superconductors is of interest to detect emergent effects. Here we report the superconductivity in a new layered Cu-based co  ...[more]

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