Daily Overview: This post sorts papers by relevance to nickelate superconductors. Summaries are AI-generated and may contain errors. arXiv submission processing window: times are unavailable (UTC).
1. Superconductor-insulator transitions in infinite-layer nickelates controlled via ${operando}$ monitored reduction
- Relevance Score:
5.3023 - Authors: Heng Wang, Haoliang Huang, Wei Lv, Xianfeng Wu, Guangdi Zhou, Zihao Nie, Yueying Li, Cui Ding, Danfeng Li, Hongtao Yuan, Qi-Kun Xue, Zhuoyu Chen
- Affiliations: Tsinghua University, Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area, City University of Hong Kong, Southern University of Science and Technology, Nanjing University
- Link: http://arxiv.org/abs/2601.14072v1
- Paper page: Superconductor-insulator transitions in infinite-layer nickelates controlled via operando monitored reduction
Summary: By developing an in situ monitoring reduction (OMR) method, this study achieved continuous modulation of the Ni 3d orbital electron occupancy in infinite-layer nickelate superconductors over an ultra-wide range from approximately 3d⁷ to 3d⁹, thereby controllably driving the superconductor-insulator transition (SIT). Combining synchrotron X-ray absorption spectroscopy and scanning transmission electron microscopy analysis of oxygen atoms, the electron occupancy states were precisely calibrated, and the SIT was further modulated using ionic liquid gating and magnetic fields. Nernst effect measurements reveal that, unlike in cuprates, pairing initiates as soon as the resistance starts to drop, while the Meissner effect only appears in the zero-resistance state, marking the establishment of global phase coherence. Angle-dependent magnetotransport studies show that within the transition temperature range, superconductivity exhibits a mixture of two-dimensional and three-dimensional characteristics, indicating that the observed SIT deviates from the classical 2D model. These results provide a unique perspective for understanding the interplay between structural and electronic phase transitions in infinite-layer nickelates within the oxygen content–magnetic field–temperature parameter space.