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Experimental Evidence for a High-Pressure Isostructural Phase Transition in Osmium

Abstract : We have measured the isothermal equation of state (EOS) of osmium to 75 GPa under hydrostatic conditions at room temperature using angle-dispersive x-ray diffraction. A least-squares fit of this data using a third-order Birch-Murnaghan EOS yields an isothermal bulk modulus K 0 ˆ 411 6 GPa, showing osmium is more compressible than diamond. Most importantly, we have documented an anomaly in the compressibility around 25 GPa associated with a discontinuity in the first pressure derivative of the c=a ratio. This discontinuity plausibly arises from the collapse of the small hole-ellipsoid in the Fermi surface near the L point.
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Florent Occelli, Daniel Farber, James Badro, Chantel Aracne, David Teter, et al.. Experimental Evidence for a High-Pressure Isostructural Phase Transition in Osmium. Physical Review Letters, American Physical Society, 2004, 93, pp.095502. ⟨10.1103/PhysRevLett.93.095502⟩. ⟨insu-01387809⟩

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