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- W4367060520 abstract "We have experimentally investigated the low-temperature (0.6 K) electronic and magnetic properties of the layered antiferromagnet EuZn2As2 in pulsed magnetic fields of up to 60 T at a temperature of 0.6 K, giant positive magnetoresistance (MR) is observed above mu_{0}H ~ 20 T, a regime in which the spins are already fully polarized. Both magnetic torque and proximity detector oscillator (PDO) data show no corresponding anomaly at or close to this field. By analyzing the quantum oscillations observed in the MR and PDO frequency, we find that (1) the oscillation frequency F = 46 pm 6 T for H // c and 42 pm 2 T 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 fields corresponds to the quantum limit (i.e., only the last Landau level being occupied). From these observations we conclude that the linear MR can be understood by considering diffusing cyclotron centers in the quantum limit. Our findings help understand the intimate relationship between magnetism and electronic topology in EuZn2As2 under extremely high fields and suggest reasons for the emergent behavior in the quantum limit." @default.
- W4367060520 created "2023-04-27" @default.
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- W4367060520 date "2023-04-24" @default.
- W4367060520 modified "2023-10-14" @default.
- W4367060520 title "Quantum-limit phenomena and bandstructure in the magnetic topological semimetal EuZn2As2" @default.
- W4367060520 doi "https://doi.org/10.48550/arxiv.2304.12426" @default.
- W4367060520 hasPublicationYear "2023" @default.
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