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We report quantum oscillation data on the metallic triangular antiferromagnetPdCrO$_2$. We find that, to very high accuracy, the observed frequencies ofPdCrO$_2$ can be reproduced by reconstruction of the (nonmagnetic) PdCoO$_2$Fermi surface into a reduced zone. The reduced zone corresponds to a magneticcell containing six chromium sites, giving a $\sqrt{3} \times \sqrt{3}$in-plane reconstruction, and $\times 2$ interplane reconstruction. Theinterplane ordering represents a reduction in lattice symmetry, possibly tomonoclinic, and an associated lattice distortion is expected. In addition, wereport a magnetic transition under an applied in-plane field that is probablyequivalent to the spin-flop transition reported for CuCrO$_2$, and present dataon its field-angle dependence. We also report measurements of the resistivityof PdCrO$_2$ up to 500 K.

Quantum Oscillations and Magnetic Reconstruction in the Delafossite PdCrO$_2$