Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuInAs
arXiv:2403.03022 · doi:10.1103/PhysRevB.111.L081109
Abstract
Zintl phase EuInAs has garnered growing attention as an axion insulator candidate, triggered by the identification of a commensurate double- broken-helix state in previous studies, however, its periodicity and symmetry remain subjects of debate. Here, we perform resonant x-ray scattering experiments on EuInAs, revealing an incommensurate nature of the broken-helix state, where both the wave number and the amplitude of the helical modulation exhibit systematic sample dependence. Furthermore, the application of an in-plane magnetic field brings about a fanlike state that appears to preserve the double- nature, which might be attributed to multiple-spin interactions in momentum space. We propose that the itinerant character of EuInAs, most likely induced by Eu deficiency, gives rise to the helical modulation and impedes the realization of a theoretically-predicted axion state with the collinear antiferromagnetic order.
arXiv comment6 pages, 5 figures, SM: 13 pages, 9 figures, published in Phys. Rev. B
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