Pressure-induced evolution of superconductivity and topological electronic structure in LaNiGa2

Abstract

LaNiGa2, as a time-reversal symmetry breaking superconductor, has garnered significant attention due to distinctive Dirac points and nonunitary triplet pairing. Here, we investigate the superconducting properties of LaNiGa2 under high pressure and uncover a dome-like behavior in its superconducting phase, with a maximum critical temperature TC of 3.2 K at approximately 16 GPa. Remarkably, superconductivity abruptly vanishes above 26 GPa, coinciding with an orthorhombic-to-monoclinic structural transition. This pressure-driven evolution may be closely linked to distinct energy shifts of Dirac points and electron-phonon coupling enhancement. Our findings reveal a profound interplay between topological electronic band structure and time-reversal symmetry breaking superconductivity in LaNiGa2, offering new insights into the engineering of quantum materials through symmetry and band structure control.

Source-reported materials — not catalogue approval

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