Fermi surface of ReO3above the "compressibility-collapse" transition

The Re${\mathrm{O}}_3$ Fermi surface above the pressure-induced "compressibility-collapse" transition is derived from the simple cubic band structure, assuming $T_h^5\left(Im3\right)$ symmetry for the distorted phase. A new set of closely spaced de Haas—van Alphen (dHvA) frequencies have been observed which are consistent with this model. Magnetic-breakdown effects dominate the dHvA data at higher magnetic fields. As a result, only three relatively low frequencies, all involving orbits on the new first-zone hole surface, have been detected thus far.