Our neutron scattering study revealed that NpNiGa5 has a canted structure with the antiferromagnetic (AFM) component along [1 1 0] with q = ( frac(1, 2) frac(1, 2) frac(1, 2) ) below 18 K, superposed on a ferromagnetic (FM) component along the c-axis. A simple FM order remains stable with elevating temperature ( 18 K < T < 30 K) or applying field ( μ0 H > 8 T) along [1 1 0]. The large difference in the magnetic moment for these two structures indicates that the transition at TN = 18 K is attributed to the 5f electronic transition between the low-moment FM state and high-moment state accompanying the in-plane AFM component perpendicular to the quantization c-axis. It can be qualitatively understood by a localized 5f model with competing interactions, while the 5f electrons are believed to be itinerant from the partial quenching of the orbital contribution in the magnetic form factor.
- Cant magnetism
- Magnetic phase diagram
- Metamagnetic transition
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering