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We report the de Haas-van Alphen (dHvA) oscillations and first-principlecalculations for triangular antiferromagnet PdCrO2 showing unconventionalanomalous Hall effect (AHE). The dHvA oscillations in PdCrO2 reveal presence ofseveral 2 dimensional Fermi surfaces of smaller size than found in nonmagneticPdCoO2. This evidences Fermi surface reconstruction due to the non-collinear120 antiferromagnetic ordering of the localized Cr, consistent with the firstprinciple calculations. The temperature dependence of dHvA oscillations showsno signature of additional modification of Cr spin structure below TN.Considering that the 120 helical ordering of Cr spins has a zero scalar spinchirality, our results suggest that PdCrO2 is a rare example of the metallictriangular antiferromagnets whose unconventional AHE can not be understood interms of the spin chirality mechanism.

Quantum Oscillations of the Metallic Triangular-lattice Antiferromagnet PdCrO2