Rotational symmetry breaking in superconducting nickelate Nd0.8Sr0.2NiO2 films

Haoran Ji, Yi Liu, Yanan Li, Xiang Ding, Zheyuan Xie, Chengcheng Ji, Shichao Qi, Xiaoyue Gao, Minghui Xu, Peng Gao, Liang Qiao (), Yi-feng Yang, Guang-Ming Zhang and Jian Wang ()
Additional contact information
Haoran Ji: Peking University
Yi Liu: Renmin University of China
Yanan Li: Peking University
Xiang Ding: University of Electronic Science and Technology of China
Zheyuan Xie: Peking University
Chengcheng Ji: Peking University
Shichao Qi: Peking University
Xiaoyue Gao: Peking University
Minghui Xu: University of Electronic Science and Technology of China
Peng Gao: Peking University
Liang Qiao: University of Electronic Science and Technology of China
Yi-feng Yang: Chinese Academy of Sciences
Guang-Ming Zhang: Tsinghua University
Jian Wang: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract The infinite-layer nickelates, isostructural to the high-Tc cuprate superconductors, have emerged as a promising platform to host unconventional superconductivity and stimulated growing interest in the condensed matter community. Despite considerable attention, the superconducting pairing symmetry of the nickelate superconductors, the fundamental characteristic of a superconducting state, is still under debate. Moreover, the strong electronic correlation in the nickelates may give rise to a rich phase diagram, where the underlying interplay between the superconductivity and other emerging quantum states with broken symmetry is awaiting exploration. Here, we study the angular dependence of the transport properties of the infinite-layer nickelate Nd0.8Sr0.2NiO2 superconducting films with Corbino-disk configuration. The azimuthal angular dependence of the magnetoresistance (R(φ)) manifests the rotational symmetry breaking from isotropy to four-fold (C4) anisotropy with increasing magnetic field, revealing a symmetry-breaking phase transition. Approaching the low-temperature and large-magnetic-field regime, an additional two-fold (C2) symmetric component in the R(φ) curves and an anomalous upturn of the temperature-dependent critical field are observed simultaneously, suggesting the emergence of an exotic electronic phase. Our work uncovers the evolution of the quantum states with different rotational symmetries in nickelate superconductors and provides deep insight into their global phase diagram.

Date: 2023
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DOI: 10.1038/s41467-023-42988-8

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