Itinerant electron metamagnetism in LaCo$_9$Si$_4$

Details Itinerant electron metamagnetism in LaCo$_9$Si$_4$ Itinerant electron metamagnetism in LaCo$_9$Si$_4$

2003-09-09

arxiv.org/abs/cond-mat/0309217v2

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 5 figures, PRB Rapid Communication, in print

Scientific paper

10.1103/PhysRevB.69.081404

The strongly exchange enhanced Pauli paramagnet LaCo$_9$Si$_4$ 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 $H\bot c$, which is the lowest value ever found for rare earth intermetallic compounds. In the ferromagnetic state there appears a moment of about 0.2 $\mu_B$/Co at the $16k$ Co-sites, but sigificantly smaller moments at the 4d and $16l$ Co-sites.

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