Ultra-small moment incommensurate spin density wave order masking a ferromagnetic quantum critical point in NbFe${}_2$

P. G. Niklowitz, M. Hirschberger, M. Lucas +8

In the metallic magnet Nb${}_{1-y}$Fe${}_{2+y}$, the low temperature threshold of ferromagnetism can be investigated by varying the Fe excess $y$ within a narrow homogeneity range. We…