Observation of two ferromagnetic phases in Fe3Mo3N
Abstract
We report alloying-induced and field-induced ferromagnetism in the η-carbide-type compound Fe3Mo3N, which shows a non-Fermi-liquid behavior in the vicinity of a ferromagnetic quantum critical point. Co substitution induces ferromagnetism in (Fe1-xCox)3Mo3N in the composition range 0.05≤x ≤0.60. With increasing x, the magnetism varies from the Curie-Weiss-type paramagnetism with a maximum in the temperature dependence of the magnetic susceptibility to another paramagnetism without the maximum via a weak ferromagnetism. An itinerant electron metamagnetic transition is observed for low x at a magnetic field of ∼14 T. The magnetic phase diagram, in which the alloying-induced and the field-induced ferromagnetic phases are separated, is different from conventional phase diagrams for weak ferromagnets. Taking account of the fact that a magnetic field induces a Fermi-liquid behavior, the quantum criticality for pure Fe3Mo3N appears to be dominated by the dispersive spin fluctuations observed in the alloying-induced ferromagnetic phase.
- Publication:
-
Physical Review B
- Pub Date:
- July 2014
- DOI:
- 10.1103/PhysRevB.90.014416
- Bibcode:
- 2014PhRvB..90a4416W
- Keywords:
-
- 75.30.Kz;
- 75.50.Cc;
- Magnetic phase boundaries;
- Other ferromagnetic metals and alloys