Lattice collapse and the magnetic phase diagram of Sr1-x Cax Co2 P2

Shuang Jia, A. J. Williams, P. W. Stephens, R. J. Cava

Research output: Contribution to journalArticle

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Abstract

We report that the 122-type Sr1-x Cax Co2 P2 solid solution undergoes an anomalous structural transition from the uncollapsed to the collapsed ThCr2 Si2 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.

Original languageEnglish (US)
Article number165107
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number16
DOIs
StatePublished - Oct 6 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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