Common effect of chemical and external pressures on the magnetic properties of R CoPO (R= La, Pr, Nd, Sm).

G. Prando, G. Profeta, A. Continenza, R. Khasanov, A. Pal, V. P.S. Awana, B. Büchner, S. Sanna

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5 Citations (Scopus)

Abstract

We investigate the direct correspondence between Co band ferromagnetism and structural parameters in the pnictide oxides RCoPO for different rare-earth ions (R=La,Pr,Nd,Sm) by means of muon-spin spectroscopy and ab initio calculations, complementing our results published previously [G. Prando et al., Common effect of chemical and external pressures on the magnetic properties of RCoPO (R=La,Pr), Phys. Rev. B 87, 064401 (2013)PRBMDO1098-012110.1103/PhysRevB.87.064401]. We find that both the transition temperature to the ferromagnetic phase TC and the volume of the crystallographic unit cell V are conveniently tuned by the R ionic radius and/or external pressure. We report a linear correlation between TC and V and our ab initio calculations unambiguously demonstrate a full equivalence of chemical and external pressures. As such, we show that R ions influence the ferromagnetic phase only via the induced structural shrinkage without involving any active role from the electronic f degrees of freedom, which are only giving a sizable magnetic contribution at much lower temperatures.

Original languageEnglish
Article number144414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number14
DOIs
Publication statusPublished - 12-10-2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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