  We have observed a massive reconstruction of the Fermi surface of single
crystal chromium as a function of high pressure and high magnetic fields caused
by the spin-flip transition, with multiple new orbits appearing above 0.93 GPa.
Additionally, some orbits have field-induced effective masses of ~0.06-0.07 me,
seen only at high magnetic fields. Based on the temperature insensitivity
displayed by the oscillation amplitudes at these frequencies, we attribute the
orbits to quantum interference rather than to Landau quantization.
