Non-Fermi-liquid behaviour in La4Ru6O19

P. Khalifah, K. D. Nelson, R. Jin, Z. Q. Mao, Y. Liu, Q. Huang, X. P.A. Gao, A. P. Ramirez, Robert Joseph Cava

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

Understanding the complexities of electronic and magnetic ground states in solids is one of the main goals of solid-state physics. Transition-metal oxides have proved to be particularly fruitful in this regard, especially for those materials with the perovskite structure, where the special characteristics of transition-metal-oxygen orbital hybridization determine their properties. Ruthenates have recently emerged as an important family of perovskites because of the unexpected evolution from high-temperature ferromagnetism in SrRuO3 to low-temperature superconductivity in Sr2RuO4 (refs 1, 2). Here we show that a ruthenate in a different structural family, La4Ru6O19, displays a number of highly unusual properties, most notably non-Fermi-liquid behaviour. The properties of La4Ru6O19 have no analogy among the thousands of previously characterized transitionmetal oxides. Instead, they resemble those of CeCu6-xAux -5 a widely studied f-electron-based heavy fermion intermetallic compound that is often considered as providing the best example of non-Fermi-liquid behaviour. In the ruthenate, non-Fermi-liquid behaviour appears to arise from just the right balance between the interactions of localized electronic states derived from Ru-Ru bonding and delocalized states derived from Ru-O hybridization.

Original languageEnglish (US)
Pages (from-to)669-671
Number of pages3
JournalNature
Volume411
Issue number6838
DOIs
StatePublished - Jun 7 2001

All Science Journal Classification (ASJC) codes

  • General

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