First observation of the inverse Dzyaloshinsky-Moriya effect in metals; magnetization and neutron scattering study on the metallic helimagnet MnP

Details First observation of the inverse Dzyaloshinsky-Moriya effect in metals; magnetization and neutron scattering study on the metallic helimagnet MnP First observation of the inverse Dzyaloshinsky-Moriya effect in metals; magnetization and neutron scattering study on the metallic helimagnet MnP

2011-06-22

arxiv.org/abs/1106.4599v2

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 6 figures

Scientific paper

In this study, we report a possible inverse effect of the Dzyaloshinsky-Moriya (DM) interaction in the classical metallic helimagnet MnP. Our neutron-scattering and magnetization measurements showed that the previously reported magnetic structures of MnP need to be modified as follows; a canted antiferromagnetic structure with weak ferromagnetic magnetization along the b-axis is realized in the temperature range of 47 K < T < 282 K, whereas at the low temperatures T < 47 K an alternatively tilted helimagnetic structure is obtained. Surprisingly, a distinct enhancement of the weak ferromagnetic magnetization was observed in the canted antiferromagnetic phase after cooling the sample down to the tilted helimagnetic phase once, compared to that for the initial cooling. We suggest that this peculiar temperature hysteresis is due to the inverse effect of the DM interaction; the DM interaction induces the lattice distortion in the tilted helimagnetic phase by its inverse effect, and this distortion remains even when the sample is warmed up to the canted antiferromagnetic phase, resulting in the larger b-component.

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