Partial Antiferromagnetic Helical Order in Fe$_3$PO$_4$O$_3$

C. L. Sarkis; M. J. Tarne; J. R. Neilson; H. B. Cao; E. Coldren; M. P. Gelfand; K. A. Ross

doi:10.1103/PhysRevB.101.184417

paper

Partial Antiferromagnetic Helical Order in Fe $_{3}$ PO $_{4}$ O $_{3}$

arXiv:1910.08818 · doi:10.1103/PhysRevB.101.184417

Abstract

Magnetic frustration in Fe $_{3}$ PO $_{4}$ O $_{3}$ has been shown to produce to an unusual magnetic state below T $_{N} = 163$ K, where incommensurate antiferromagnetic order is restricted to nanosized needle-like domains, as inferred from neutron powder diffraction. Here we show using single-crystal neutron diffraction that Fe $_{3}$ PO $_{4}$ O $_{3}$ does not exhibit a preferred ordering wavevector direction in the $ab$ plane despite having a well-defined ordering wavevector length. This results in the observation of continuous rings of scattering rather than satellite Bragg peaks. The lack of a preferred incommensurate ordering wavevector direction can be understood in terms of an antiferromagnetic Heisenberg model with nearest-neighbor ( $J_{1}$ ) and second-neighbor ( $J_{2}$ ) interactions, which produces a quasi-degenerate manifold of ordering wavevectors. This state appears to be similar to the partially ordered phase of MnSi, but in Fe $_{3}$ PO $_{4}$ O $_{3}$ arises in a frustrated antiferromagnet rather than a chiral ferromagnet.

Partial Antiferromagnetic Helical Order in Fe $_{3}$ PO $_{4}$ O $_{3}$

Abstract

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Partial Antiferromagnetic Helical Order in Fe3​PO4​O3​

Abstract

References in corpus (11)

Cited by in corpus (2)

Partial Antiferromagnetic Helical Order in Fe $_{3}$ PO $_{4}$ O $_{3}$