Itinerant Antiferromagnetism in RuO2

Published

Journal Article

© 2017 American Physical Society. Bulk rutile RuO2 has long been considered a Pauli paramagnet. Here we report that RuO2 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 0.05μB 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 RuO2 unique among ruthenate compounds and among oxide materials in general.

Full Text

Duke Authors

Cited Authors

  • Berlijn, T; Snijders, PC; Delaire, O; Zhou, HD; Maier, TA; Cao, HB; Chi, SX; Matsuda, M; Wang, Y; Koehler, MR; Kent, PRC; Weitering, HH

Published Date

  • February 15, 2017

Published In

Volume / Issue

  • 118 / 7

PubMed ID

  • 28256891

Pubmed Central ID

  • 28256891

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/PhysRevLett.118.077201

Citation Source

  • Scopus