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 and R. J. Cava ()
Additional contact information
P. Khalifah: Princeton University
K. D. Nelson: The Pennsylvania State University
R. Jin: The Pennsylvania State University
Z. Q. Mao: The Pennsylvania State University
Y. Liu: The Pennsylvania State University
Q. Huang: NIST Center for Neutron Research, National Institute of Standards and Technology
X. P. A. Gao: Lucent Technologies
A. P. Ramirez: Lucent Technologies
R. J. Cava: Princeton University

Nature, 2001, vol. 411, issue 6838, 669-671

Abstract: 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 transition-metal oxides. Instead, they resemble those of CeCu6-xAux—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.

Date: 2001
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DOI: 10.1038/35079534

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