Publications [#324787] of Olivier Delaire

Papers Published
  1. Berlijn, T; Snijders, PC; Delaire, O; Zhou, H-D; Maier, TA; Cao, H-B; Chi, S-X; Matsuda, M; Wang, Y; Koehler, MR; Kent, PRC; Weitering, HH, Itinerant Antiferromagnetism in RuO_{2}., Physical Review Letters, vol. 118 no. 7 (February, 2017), pp. 077201 [doi] .

    Bulk rutile RuO_{2} has long been considered a Pauli paramagnet. Here we report that RuO_{2} exhibits a hitherto undetected lattice distortion below approximately 900 K. The distortion is accompanied by antiferromagnetic order up to at least 300 K with a small room temperature magnetic moment of approximately 0.05μ_{B} as evidenced by polarized neutron diffraction. Density functional theory plus U (DFT+U) calculations indicate that antiferromagnetism is favored even for small values of the Hubbard U of the order of 1 eV. The antiferromagnetism may be traced to a Fermi surface instability, lifting the band degeneracy imposed by the rutile crystal field. The combination of high Néel temperature and small itinerant moments make RuO_{2} unique among ruthenate compounds and among oxide materials in general.