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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2019

Epsilon iron as a spin-smectic state

François Baudelet
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Thomas C Hansen

Résumé

Using X-ray emission spectroscopy, we find appreciable local magnetic moments until 30 GPa to 40 GPa in the high-pressure phase of iron; however, no magnetic order is detected with neutron powder diffraction down to 1.8 K, contrary to previous predictions. Our first-principles calculations reveal a “spin-smectic” state lower in energy than previous results. This state forms antiferromagnetic bilayers separated by null spin bilayers, which allows a complete relaxation of the inherent frustration of antiferromagnetism on a hexagonal close-packed lattice. The magnetic bilayers are likely orientationally disordered, owing to the soft interlayer excitations and the near-degeneracy with other smectic phases. This possible lack of long-range correlation agrees with the null results from neutron powder diffraction. An orientationally disordered, spin-smectic state resolves previously perceived contradictions in high-pressure iron and could be integral to explaining its puzzling superconductivity.
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Dates et versions

hal-02295306 , version 1 (19-08-2024)

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Blair Lebert, Tommaso Gorni, Michele Casula, Stefan Klotz, François Baudelet, et al.. Epsilon iron as a spin-smectic state. Proceedings of the National Academy of Sciences of the United States of America, 2019, 116 (41), pp.20280-20285. ⟨10.1073/pnas.1904575116⟩. ⟨hal-02295306⟩
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