Non-Fermi-liquid behaviour in La4Ru6O19

Citation
P. Khalifah et al., Non-Fermi-liquid behaviour in La4Ru6O19, NATURE, 411(6838), 2001, pp. 669-671
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Multidisciplinary,Multidisciplinary,Multidisciplinary
Journal title
NATURE
ISSN journal
0028-0836 → ACNP
Volume
411
Issue
6838
Year of publication
2001
Pages
669 - 671
Database
ISI
SICI code
0028-0836(200106)411:6838<669:NBIL>2.0.ZU;2-L
Abstract
Understanding the complexities of electronic and magnetic ground states in solids is one of the main goals of solid-state physics. Transition-metal ox ides have proved to be particularly fruitful in this regard, especially for those materials with the perovskite structure, where the special character istics of transition-metal-oxygen orbital hybridization determine their pro perties. Ruthenates have recently emerged as an important family of perovsk ites because of the unexpected evolution from high-temperature ferromagneti sm in SrRuO3 to low-temperature superconductivity in Sr2RuO4 (refs 1, 2). H ere we show that a ruthenate in a different structural family, La4Ru6O19, d isplays a number of highly unusual properties, most notably non-Fermi-liqui d behaviour. The properties of La4Ru6O19 have no analogy among the thousand s of previously characterized transition-metal oxides. Instead, they resemb le those of CeCu6-xAux-a widely studied f-electron-based heavy fermion inte rmetallic compound that is often considered as providing the best example o f non-Fermi-liquid behaviour. In the ruthenate, non-Fermi-liquid behaviour appears to arise from just the right balance between the interactions of lo calized electronic states derived from Ru-Ru bonding and delocalized states derived from Ru-O hybridization.