Magnetic Weyl Semimetallic Phase in Thin Films of Eu2Ir2 O7

Xiaoran Liu, Shiang Fang, Yixing Fu, Wenbo Ge, Mikhail Kareev, Jong Woo Kim, Yongseong Choi, Evguenia Karapetrova, Qinghua Zhang, Lin Gu, Eun Sang Choi, Fangdi Wen, Justin H. Wilson, Gilberto Fabbris, Philip J. Ryan, John W. Freeland, Daniel Haskel, Weida Wu, J. H. Pixley, Jak Chakhalian

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The interplay between electronic interactions and strong spin-orbit coupling is expected to create a plethora of fascinating correlated topological states of quantum matter. Of particular interest are magnetic Weyl semimetals originally proposed in the pyrochlore iridates, which are only expected to reveal their topological nature in thin film form. To date, however, direct experimental demonstrations of these exotic phases remain elusive, due to the lack of usable single crystals and the insufficient quality of available films. Here, we report on the discovery of signatures for the long-sought magnetic Weyl semimetallic phase in (111)-oriented Eu2Ir2O7 high-quality epitaxial thin films. We observed an intrinsic anomalous Hall effect with colossal coercivity but vanishing net magnetization, which emerges right below the onset of a peculiar magnetic phase with all-in-all-out (AIAO) antiferromagnetic ordering. The anomalous Hall conductivity obtained experimentally is consistent with the theoretical prediction, likely arising from the nonzero Berry curvature emanated by Weyl node pairs near the Fermi level that act as sources and sinks of Berry flux, activated by broken cubic crystal symmetry at the top and bottom terminations of the thin film.

Original languageEnglish (US)
Article number277204
JournalPhysical review letters
Volume127
Issue number27
DOIs
StatePublished - Dec 31 2021

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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