Incommensurate broken-helix and broken-fanlike states in axion insulator candidate EuIn_2As_2
arxiv(2024)
摘要
Zintl phase EuIn_2As_2 has garnered growing attention as an axion
insulator candidate, triggered by the identification of a commensurate
double-𝐐 broken-helix state in previous studies, however, its
periodicity and symmetry remain subjects of debate. Here, we perform resonant
x-ray scattering experiments on EuIn_2As_2, 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 broken-fanlike
state preserving the double-𝐐 nature, which could be attributed to
multiple-spin interactions in momentum space. We propose that the itinerant
character of EuIn_2As_2, possibly 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.
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