Charge transfer and antiferromagnetic insulator phase in SrRu1-xCrxO3 perovskites: Solid solutions between two itinerant electron oxides

A J Williams, A Gillies, J P Attfield, G Heymann, H Huppertz, M J Martinez-Lope, J A Alonso, Paul Attfield

Research output: Contribution to journalArticlepeer-review

Abstract

A full range of SrRu1-xCrxO3 perovskite solid solutions (0 < x < 1) has been prepared using high temperatures and pressures up to 10.5 GPa. The structure changes from orthorhombic Pbnm at low x through a previously unreported rhombohedral R (E) over barc phase at x=0.4 to cubic Pm (3) over barm for 0.5 < x < 1. No Cr/Ru order is evidenced at any x. A substantial Ru4++Cr4+-> Ru5++Cr3+ charge transfer is evidenced by a volume discontinuity close to x=0.5. Low Cr-doped materials (x < 0.3) are itinerant, and ferromagnetic below 160-190 K, and x > 0.7 materials are itinerant and Pauli paramagnetic, but a substantial insulating region is found between these limits. Neutron diffraction shows the x=0.4 material to be antiferromagnetic with a high Neel temperature similar to 400 K and a saturated moment of 1.7 mu(B), despite the large Cr/Ru disorder. A 50 K magnetic transition and a low temperature structural phase change to orthorhombic Imma symmetry have been discovered in SrCrO3, suggesting that the ground state of this simple perovskite is more complex than was previously assumed.

Original languageEnglish
Article number104409
Pages (from-to)-
Number of pages7
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume73
Issue number10
DOIs
Publication statusPublished - Mar 2006

Keywords

  • FERROMAGNET SRRUO3
  • TRANSPORT

Cite this