Dimer breaking and high-temperature ferromagnetism in LaCo2 (Ge1-x Px) 2

Shuang Jia, R. J. Cava

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17 Scopus citations


We report the destabilization of the lattice collapsed phase of LaCo 2 Ge2 due to X-X (X=Ge1-x Px) dimer breaking in the LaCo2 (Ge1-x Px) 2 solid solution. The magnetic properties of the system are strongly affected. P substitution for Ge can first be understood as a simple band-filling effect that drives the system from a Pauli paramagnet to a ferromagnet for 0≤x≤0.7. The ferromagnetic Curie temperature (TC) reaches 230 K for x=0.7. For 0.7≤x≤1, however, the extra electron donated by the P substitution is consumed in breaking the X-X dimers present, decreasing the layer-to-layer magnetic coupling and correspondingly suppressing TC.

Original languageEnglish (US)
Article number180410
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number18
StatePublished - Nov 18 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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