Superconductivity in nickel based 112 systems

2021/09/16 by Qiangqiang Gu, Hai-Hu Wen · 1 citation
Physics and Astronomy · #cond-mat.supr-con

paper · pdf · doi:10.1016/j.xinn.2021.100202

published as The Innovation 3(1), 100202 (2022) · 53 pages,10 figures,submitted to The Innovation

arxiv created 2021/09/16 · arxiv updated 2022/01/14

Abstract

Superconductivity has been discovered recently in nickel based 112 infinite thin films R_1-xA_xNiO₂ (R = La, Nd, Pr and A = Sr, Ca). They are isostructural to the infinite-layer cuprate (Ca,Sr)CuO₂ and are supposed to have a formal Ni 3d⁹ valence, thus providing a new platform to study the unconventional pairing mechanism of high-temperature superconductors. This important discovery immediately triggers a huge amount of innovative scientific curiosity in the field. In this paper, we try to give an overview of the recent research progress on the newly found superconducting nickelate systems, both from experimental and theoretical aspects. We will focus mainly on the electronic structures, magnetic excitations, phase diagrams, superconducting gaps and finally make some open discussions for possible pairing symmetries in Ni based 112 systems.

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• General trends of electronic structures, superconducting pairing, and magnetic correlations in the Ruddlesden-Popper nickelate m-layered superconductors La_m+1Ni_mO_3m+1