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Abstract:
We report quantum oscillation data on the metallic triangular
antiferromagnet PdCrO2. We find that, to very high accuracy, the
observed frequencies of PdCrO2 can be reproduced by reconstruction of
the (nonmagnetic) PdCoO2 Fermi surface into a reduced zone. The reduced
zone corresponds to a magnetic cell containing six chromium sites,
giving a root 3 x root 3 in-plane reconstruction, and x2 interplane
reconstruction. The interplane ordering represents a reduction in
lattice symmetry, possibly to monoclinic, and an associated lattice
distortion is expected. In addition, we report a magnetic transition
under an applied in-plane field that is probably equivalent to the
spin-flop transition reported for CuCrO2, and present data on its
field-angle dependence. We also report measurements of the resistivity
of PdCrO2 up to 500 K.
