Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd$_2$As$_2$

M. C. Rahn; J. -R. Soh; S. Francoual; L. S. I. Veiga; J. Strempfer; J. Mardegan; D. Y. Yan; Y. F. Guo; Y. G. Shi; A. T. Boothroyd

doi:10.1103/PhysRevB.97.214422

Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd$_2$As$_2$

Strongly Correlated Electrons 2018-07-04 v3

Authors: M. C. Rahn , J. -R. Soh , S. Francoual , L. S. I. Veiga , J. Strempfer , J. Mardegan , D. Y. Yan , Y. F. Guo , Y. G. Shi , A. T. Boothroyd

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Abstract

We use resonant elastic x-ray scattering to determine the evolution of magnetic order in EuCd $_2$ As $_2$ below $T_\textrm{N}=9.5$ \,K, as a function of temperature and applied magnetic field. We find an A-type antiferromagneticstructure with in-plane magnetic moments, and observe dramatic magnetoresistive effects associated with field-induced changes in the magnetic structure and domain populations. Our \textit{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 $T < T_\textrm{N}$ due to the breaking of $C_3$ symmetry by the magnetic structure.

Keywords

magnetic order charge transport Dirac semimetal antiferromagnetic structure magnetoresistance

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@article{arxiv.1803.07061,
  title  = {Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd$_2$As$_2$},
  author = {M. C. Rahn and J. -R. Soh and S. Francoual and L. S. I. Veiga and J. Strempfer and J. Mardegan and D. Y. Yan and Y. F. Guo and Y. G. Shi and A. T. Boothroyd},
  journal= {arXiv preprint arXiv:1803.07061},
  year   = {2018}
}

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Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd$_2$As$_2$

Abstract

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