Publications associated with X-ray and Neutron Scattering

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

Physical review B: Condensed matter and materials physics American Physical Society 97 (2018) 214422

JR Soh, J Mardegan, DY Yan, S Francoual, YG Shi, A Boothroyd, MC Rahn, LSI Veiga, J Strempfer, YF Guo

We use resonant elastic x-ray scattering to determine the evolution of magnetic order in EuCd 2 As 2 below T N = 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 Cd 3 As 2 is also present in EuCd 2 As 2 , but is gapped for T < T N due to the breaking of C 3 symmetry by the magnetic structure.

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