Spin-density wave of ferrimagnetic building blocks masking the ferromagnetic quantum-critical point in NbFe2

TL;DR

This study reveals a rare case where a longitudinal spin-density wave masks the ferromagnetic quantum critical point in NbFe2, formed from ferrimagnetic blocks, highlighting complex magnetic interactions near quantum criticality.

Contribution

The paper provides the first detailed refinement of a fully characterized spin-density wave masking a ferromagnetic quantum critical point in NbFe2.

Findings

Identified a longitudinal spin-density wave in NbFe2

Revealed ferrimagnetic building blocks forming the spin-density wave

Showed the spin-density wave masks the ferromagnetic quantum critical point

Abstract

In the metallic magnet NbFe2, the low temperature threshold of ferromagnetism can be investigated by varying the Fe concentration within a narrow homogeneity range. NbFe2 is one of a number of compounds where modulated order is found to mask the ferromagnetic quantum critical point. However, here we report the rare case where the masking modulated magnetic order has been fully refined. Spherical neutron polarimetry and high-intensity single-crystal neutron diffraction reveal the first case of a longitudinal spin-density wave masking the ferromagnetic quantum critical point. The spin-density wave is characterised by a large-wavelength incommensurate modulation of its low average moment. It is formed from ferrimagnetic building blocks with antiparallel ferromagnetic sheets. The existence of ferromagnetic sheets and cancellation of the magnetisation only over mesoscopic length scales show local similarity between the spin-density wave and the ferromagnetic parent phase and indicate the spin-density wave's unconventional nature as emerging from underlying ferromagnetic quantum criticality.