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We have experimentally investigated the low-temperature (0.6 K) electronicand magnetic properties of the layered antiferromagnet EuZn2As2 in pulsedmagnetic fields of up to 60 T at a temperature of 0.6 K, giant positivemagnetoresistance (MR) is observed above \mu_{0}H ~ 20 T, a regime in which thespins are already fully polarized. Both magnetic torque and proximity detectoroscillator (PDO) data show no corresponding anomaly at or close to this field.By analyzing the quantum oscillations observed in the MR and PDO frequency, wefind that (1) the oscillation frequency F = 46 \pm 6 T for H // c and 42 \pm 2T for H // ab; (2) the corresponding Berry phase is close to \pi for H // c,implying a nontrivial topology; and (3) the large linear MR at high fieldscorresponds to the quantum limit (i.e., only the last Landau level beingoccupied). From these observations we conclude that the linear MR can beunderstood by considering diffusing cyclotron centers in the quantum limit. Ourfindings help understand the intimate relationship between magnetism andelectronic topology in EuZn2As2 under extremely high fields and suggest reasonsfor the emergent behavior in the quantum limit.

Quantum-limit phenomena and bandstructure in the magnetic topological semimetal EuZn2As2