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Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd2As2

Rahn, MC; Soh, J-R; Francoual, S; Veiga, LSI; Strempfer, J; Mardegan, J; Yan, DY; ... Boothroyd, AT; + view all (2018) Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd2As2. Physical Review B , 97 (21) , Article 214422. 10.1103/PhysRevB.97.214422. Green open access

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Abstract

We use resonant elastic x-ray scattering to determine the evolution of magnetic order in EuCd2As2 below TN = 9.5 K, as a function of temperature and applied magnetic field. We find an A-type antiferromagnetic structure with in-plane magnetic moments, and observe dramatic magnetoresistive effects associated with field-induced changes in the magnetic structure and domain populations. Our ab initio electronic structure calculations indicate that the Dirac dispersion found in the nonmagnetic Dirac semimetal Cd3As2 is also present in EuCd2As2, but is gapped for T <TN due to the breaking of C3 symmetry by the magnetic structure.

Type: Article
Title: Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd2As2
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.97.214422
Publisher version: https://doi.org/10.1103/PhysRevB.97.214422
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10076460
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