The strongly exchange enhanced Pauli paramagnet LaCo9​Si4​ is found to
exhibit an itinerant metamagnetic phase transition with indications for
metamagnetic quantum criticality. Our investigation comprises magnetic,
specific heat, and NMR measurements as well as ab-initio electronic structure
calculations. The critical field is about 3.5 T for H∣∣c and 6 T for H⊥c, which is the lowest value ever found for rare earth intermetallic
compounds. In the ferromagnetic state there appears a moment of about 0.2
μB​/Co at the 16k Co-sites, but sigificantly smaller moments at the 4d
and 16l Co-sites.Comment: 11 pages, 5 figures, PRB Rapid Communication, in prin