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Possible spin-orbit driven spin-liquid ground state in the double perovskite phase of Ba<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>YIr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>9</mml:mn></mml:msub></mml:math>
We report the structural transformation of hexagonal Ba${}_{3}$YIr${}_{2}$O${}_{9}$ to a cubic double perovskite form (stable in ambient conditions) under an applied pressure of 8 GPa at 1273 K. While the ambient pressure synthesized sample undergoes long-range magnetic ordering at $\ensuremath{\sim}4$ K, the high-pressure (HP) synthesized sample does not order down …