Lattice collapse and the magnetic phase diagram of Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$

Abstract

We report that the 122 type Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$ solid solution undergoes an anomalous structural transition from the uncollapsed to the collapsed ThCr${}_2$Si${}_2$ structure at a distinct onset composition near $x=0.5$. Correlated with the structural changes, the electronic system evolves from a nearly ferromagnetic Fermi liquid to an antiferromagnetic metal, through a complex crossover regime. The structural collapse, driven by P-P bonding across the (Sr,Ca) layers, is much more pronounced in this system than it is in the analogous Fe-based system, indicating a strong sensitivity of structure to total electron count in the transition metal pnictide 122 family.

5 pages, 7 figures, accepted by PRB

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