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Superconducting Dome and Quantum Criticality in Two-Dimensional NbO2 Triangular Lattice
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Superconducting Dome and Quantum Criticality in Two-Dimensional NbO2 Triangular Lattice
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Paper
Superconducting Dome and Quantum Criticality in Two-Dimensional NbO2 Triangular Lattice
2025
Overview
The emergence of superconductivity with strong correlation is one of the most attracted issues in condensed-matter physics, as seen in various unconventional superconductors. Here we show a new strongly correlated superconductor Li1-xNbO2 with rich characteristics such as two-dimensional, geometrically frustrated, and triangular NbO2 lattice and correlated flat-band-like electronic states. We revealed the electronic phase diagram by implementing Li-ion electrochemical cells with LiNbO2 epitaxial films. The Li-ion deintercalation increased the hole-doping level in NbO2 layer, along which a band insulator LiNbO2 underwent to a Fermi-liquid (FL) metal and superconductor associated with non-Fermi liquid (NFL) characters. The evolution of the NFL state coincided with the suppression of the Kondo-singlet formation near the superconducting dome, which linked superconductivity with quantum criticality. The obtained phase diagram involves general aspects of strongly correlated superconductors and bridges the gap between various systems.
Publisher
Cornell University Library, arXiv.org
