Abstract
The stability under pressure of charge order $({\mathrm{Ni}}^{3+\ensuremath{\delta}}/{\mathrm{Ni}}^{3\ensuremath{-}\ensuremath{\delta}})$ in ${\mathrm{YNiO}}_{3}$ has been investigated by infrared spectroscopy and x-ray synchrotron diffraction studies up to 23 GPa. We report the observation of a sudden electronic and structural transition in the pressure dependence of ${\mathrm{YNiO}}_{3}$ at $\ensuremath{\approx}14\mathrm{GPa}.$ The pressure-induced lattice evolution is consistent with a ${P2}_{1}/n$ to $\mathrm{Pbnm}$ structural transformation similar to the previously reported thermal melting of the charge-ordered state. Phonon screening indicating rapid electron hopping in the high-pressure phase has been observed from infrared measurements. However, although the conductivity increases due to partial charge delocalization, a metallic phase was not confirmed above the pressure-induced transition.
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